chr start stop reference nuc variant nuc depth genic status zygosity variant ID 20 2502277 2502278 C T 29 GENIC homozygous 109388694 20 2502648 2502649 G A 33 GENIC homozygous 109388695 20 2506535 2506536 G A 32 GENIC homozygous 109388696