APQY - Heaton,M.P.; Leymaster,K.A.; Freking,B.A.; Hawk,D.A.; Smith,T.P.; Keele,J.W.; Snelling,W.M.; Fox,J.M.; Chitko-McKown,C.G.; Laegreid,W.W. - Prion gene sequence variation within diverse groups of U.S. sheep, beef cattle, and deer. - Mammalian Genome 2003 Nov; 14(11): 765-77