Table 2.

Nucleotide polymorphism in western and eastern gorillas

	Species	heterozygous site rate (%)	homozygous site rate (%)	hom:het ratio
Kamilah	western lowland	0.189	0.0015	-
EB(JC)	western lowland	0.178	0.10	0.56
Mukisi	eastern lowland	0.076	0.19	2.5

Rates are based on variants detected by mapping sequence data to the gorilla reference and filtering sites by depth and mapping quality (Supplementary Information). The homozygosity rate for Kamilah is low (and is effectively an error rate) because her sequence was used for assembly. Reduced heterozygosity in Mukisi is not due to familial inbreeding, since there are no long homozygous stretches.