diff --git a/extras/assemblies/GRCh38.json b/extras/assemblies/GRCh38.json
index 7e5b1a039bf86f11369bcc8cab617801b0136e04..8f9e9ac6ca96bb5a4f1849217f2701cd3affd57b 100644
--- a/extras/assemblies/GRCh38.json
+++ b/extras/assemblies/GRCh38.json
@@ -128,6 +128,1311 @@
       "organelle": "mitochondrion",
       "name": "chrM",
       "accession": "NC_012920.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr15_KI270905v1_alt",
+      "accession": "NT_187660.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr6_GL000256v2_alt",
+      "accession": "NT_167249.2"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr6_GL000254v2_alt",
+      "accession": "NT_167247.2"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr6_GL000251v2_alt",
+      "accession": "NT_113891.3"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr6_GL000253v2_alt",
+      "accession": "NT_167246.2"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr6_GL000250v2_alt",
+      "accession": "NT_167244.2"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr6_GL000255v2_alt",
+      "accession": "NT_167248.2"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr6_GL000252v2_alt",
+      "accession": "NT_167245.2"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr17_KI270857v1_alt",
+      "accession": "NT_187614.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr16_KI270853v1_alt",
+      "accession": "NT_187607.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr17_GL000258v2_alt",
+      "accession": "NT_167251.2"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr5_GL339449v2_alt",
+      "accession": "NW_003315917.2"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr14_KI270847v1_alt",
+      "accession": "NT_187601.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr17_KI270908v1_alt",
+      "accession": "NT_187663.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr14_KI270846v1_alt",
+      "accession": "NT_187600.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr5_KI270897v1_alt",
+      "accession": "NT_187651.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr7_KI270803v1_alt",
+      "accession": "NT_187562.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr19_GL949749v2_alt",
+      "accession": "NW_003571057.2"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr19_KI270938v1_alt",
+      "accession": "NT_187693.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr19_GL949750v2_alt",
+      "accession": "NW_003571058.2"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr19_GL949748v2_alt",
+      "accession": "NW_003571056.2"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr19_GL949751v2_alt",
+      "accession": "NW_003571059.2"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr19_GL949746v1_alt",
+      "accession": "NW_003571054.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr19_GL949752v1_alt",
+      "accession": "NW_003571060.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr8_KI270821v1_alt",
+      "accession": "NT_187576.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr1_KI270763v1_alt",
+      "accession": "NT_187519.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr6_KI270801v1_alt",
+      "accession": "NT_187556.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr19_GL949753v2_alt",
+      "accession": "NW_003571061.2"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr19_GL949747v2_alt",
+      "accession": "NW_003571055.2"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr8_KI270822v1_alt",
+      "accession": "NT_187577.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr4_GL000257v2_alt",
+      "accession": "NT_167250.2"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr12_KI270904v1_alt",
+      "accession": "NT_187658.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr4_KI270925v1_alt",
+      "accession": "NT_187679.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr15_KI270852v1_alt",
+      "accession": "NT_187602.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr9_KI270823v1_alt",
+      "accession": "NT_187578.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr15_KI270850v1_alt",
+      "accession": "NT_187606.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr1_KI270759v1_alt",
+      "accession": "NT_187516.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr12_GL877876v1_alt",
+      "accession": "NW_003571050.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr17_KI270862v1_alt",
+      "accession": "NT_187613.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr15_GL383555v2_alt",
+      "accession": "NW_003315944.2"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr19_GL383573v1_alt",
+      "accession": "NW_003315962.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr4_KI270896v1_alt",
+      "accession": "NT_187650.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr4_GL383528v1_alt",
+      "accession": "NW_003315915.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr17_GL383563v3_alt",
+      "accession": "NW_003315952.3"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr8_KI270810v1_alt",
+      "accession": "NT_187567.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr1_GL383520v2_alt",
+      "accession": "NW_003315907.2"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr1_KI270762v1_alt",
+      "accession": "NT_187515.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr15_KI270848v1_alt",
+      "accession": "NT_187603.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr17_KI270909v1_alt",
+      "accession": "NT_187661.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr14_KI270844v1_alt",
+      "accession": "NT_187598.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr8_KI270900v1_alt",
+      "accession": "NT_187654.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr10_GL383546v1_alt",
+      "accession": "NW_003315935.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr13_KI270838v1_alt",
+      "accession": "NT_187592.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr8_KI270816v1_alt",
+      "accession": "NT_187571.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr22_KI270879v1_alt",
+      "accession": "NT_187633.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr8_KI270813v1_alt",
+      "accession": "NT_187570.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr11_KI270831v1_alt",
+      "accession": "NT_187585.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr15_GL383554v1_alt",
+      "accession": "NW_003315943.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr8_KI270811v1_alt",
+      "accession": "NT_187565.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr18_GL383567v1_alt",
+      "accession": "NW_003315956.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chrX_KI270880v1_alt",
+      "accession": "NT_187634.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr8_KI270812v1_alt",
+      "accession": "NT_187568.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr19_KI270921v1_alt",
+      "accession": "NT_187675.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr17_JH159146v1_alt",
+      "accession": "NW_003871091.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chrX_KI270913v1_alt",
+      "accession": "NT_187667.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr6_KI270798v1_alt",
+      "accession": "NT_187553.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr7_KI270808v1_alt",
+      "accession": "NT_187564.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr22_KI270876v1_alt",
+      "accession": "NT_187630.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr15_KI270851v1_alt",
+      "accession": "NT_187604.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr22_KI270875v1_alt",
+      "accession": "NT_187629.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr1_KI270766v1_alt",
+      "accession": "NT_187517.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr19_KI270882v1_alt",
+      "accession": "NT_187636.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr3_KI270778v1_alt",
+      "accession": "NT_187536.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr15_KI270849v1_alt",
+      "accession": "NT_187605.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr4_KI270786v1_alt",
+      "accession": "NT_187543.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr12_KI270835v1_alt",
+      "accession": "NT_187587.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr17_KI270858v1_alt",
+      "accession": "NT_187615.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr19_KI270867v1_alt",
+      "accession": "NT_187620.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr16_KI270855v1_alt",
+      "accession": "NT_187608.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr8_KI270926v1_alt",
+      "accession": "NT_187680.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr5_GL949742v1_alt",
+      "accession": "NW_003571036.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr3_KI270780v1_alt",
+      "accession": "NT_187537.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr17_GL383565v1_alt",
+      "accession": "NW_003315954.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr2_KI270774v1_alt",
+      "accession": "NT_187529.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr4_KI270790v1_alt",
+      "accession": "NT_187540.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr11_KI270927v1_alt",
+      "accession": "NT_187681.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr19_KI270932v1_alt",
+      "accession": "NT_187686.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr11_KI270903v1_alt",
+      "accession": "NT_187657.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr2_KI270894v1_alt",
+      "accession": "NT_187648.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr11_KI270832v1_alt",
+      "accession": "NT_187586.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr7_KI270805v1_alt",
+      "accession": "NT_187560.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr7_KI270809v1_alt",
+      "accession": "NT_187561.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr19_KI270887v1_alt",
+      "accession": "NT_187641.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr4_KI270789v1_alt",
+      "accession": "NT_187545.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr3_KI270779v1_alt",
+      "accession": "NT_187532.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr19_KI270914v1_alt",
+      "accession": "NT_187668.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr19_KI270886v1_alt",
+      "accession": "NT_187640.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr11_KI270829v1_alt",
+      "accession": "NT_187583.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr21_GL383579v2_alt",
+      "accession": "NW_003315968.2"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr11_JH159136v1_alt",
+      "accession": "NW_003871073.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr19_KI270930v1_alt",
+      "accession": "NT_187684.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr18_GL383571v1_alt",
+      "accession": "NW_003315960.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr19_KI270920v1_alt",
+      "accession": "NT_187674.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr6_KI270797v1_alt",
+      "accession": "NT_187552.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr3_KI270935v1_alt",
+      "accession": "NT_187689.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr17_KI270861v1_alt",
+      "accession": "NT_187611.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr15_KI270906v1_alt",
+      "accession": "NT_187659.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr5_KI270791v1_alt",
+      "accession": "NT_187547.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr16_GL383556v1_alt",
+      "accession": "NW_003315945.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr13_KI270840v1_alt",
+      "accession": "NT_187594.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr11_JH159137v1_alt",
+      "accession": "NW_003871074.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr19_KI270917v1_alt",
+      "accession": "NT_187671.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr7_KI270899v1_alt",
+      "accession": "NT_187653.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr19_KI270923v1_alt",
+      "accession": "NT_187677.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr10_KI270825v1_alt",
+      "accession": "NT_187580.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr19_GL383576v1_alt",
+      "accession": "NW_003315965.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr19_KI270922v1_alt",
+      "accession": "NT_187676.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr22_KI270878v1_alt",
+      "accession": "NT_187632.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr19_KI270929v1_alt",
+      "accession": "NT_187683.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr11_KI270826v1_alt",
+      "accession": "NT_187581.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr6_KB021644v2_alt",
+      "accession": "NW_004166862.2"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr1_KI270765v1_alt",
+      "accession": "NT_187520.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr19_KI270916v1_alt",
+      "accession": "NT_187670.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr19_KI270890v1_alt",
+      "accession": "NT_187644.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr3_KI270784v1_alt",
+      "accession": "NT_187539.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr12_GL383551v1_alt",
+      "accession": "NW_003315940.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr20_KI270870v1_alt",
+      "accession": "NT_187624.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr1_GL383518v1_alt",
+      "accession": "NW_003315905.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr10_KI270824v1_alt",
+      "accession": "NT_187579.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr14_KI270845v1_alt",
+      "accession": "NT_187599.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr3_GL383526v1_alt",
+      "accession": "NW_003315913.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr13_KI270839v1_alt",
+      "accession": "NT_187593.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr10_GL383545v1_alt",
+      "accession": "NW_003315934.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr5_KI270792v1_alt",
+      "accession": "NT_187548.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr17_KI270860v1_alt",
+      "accession": "NT_187612.1"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr19_GL000209v2_alt",
+      "accession": "NT_113949.2"
+    },
+    {
+      "organelle": "nucleus",
+      "name": "chr11_KI270830v1_alt",
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+      "accession": "NT_187575.1"
     }
   ]
 }