chr start stop reference nuc variant nuc depth genic status zygosity variant ID 12 19172519 19172520 G C 21 GENIC homozygous 973518857 12 19172520 19172521 G T 20 GENIC homozygous 973518858 12 19172521 19172522 G T 20 GENIC homozygous 973518859