PGAP1 and male infertility: A region on chromosome 2 between 196.8 Mb and 198.0 Mb was identified in 12 of the 31 population groupings (Additional file 1: Table S2), and encompassed selection signals located between 197.0 Mb and 197.5 Mb previously reported in nine populations from HapMap and SGVP [23] that spanned PGAP1, a gene which caused perinatal lethality and male infertility in mice [27].