chr start stop reference nuc variant nuc depth genic status zygosity variant ID 12 19172519 19172520 G C 20 GENIC homozygous 986025522 12 19172520 19172521 G T 20 GENIC homozygous 986025523 12 19172521 19172522 G T 20 GENIC homozygous 986025524