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The data also supports the point that yak is classified as Poephagus of Bovinae, Poephagus including two species: Poephagus grunniens and Poephagus mucus. 支持將牦牛劃分為牛亞科牦牛屬的觀點,牦牛屬包括家牦牛和野牦牛兩個種。