chr start stop reference nuc variant nuc depth genic status zygosity variant ID 20 4539962 4539963 A G 24 GENIC homozygous 109074677 20 4540301 4540302 T C 14 GENIC homozygous 109074679 20 4540868 4540869 A G 15 GENIC homozygous 109074686