?-Lactalbumin (?-LA) and ?-lactoglobulin (?-LG) were isolated from yak milk identified by mass spectrometry. The variant of ?-LA (L8IIC8) in had 123 amino acids, the sequence differed bovine milk. acid at site 71 was Asn (N) domestic milk, but Asp (D) wild sequences. Yak ?-LG 2 variants, A (P02754) E (L8J1Z0). Both contained E, it absent 158 ?-Lg Gly (G) Glu (E) bovine. secondary structures sli...