| amino acid polymorphisms of prp gene in mongolian sheep. | to characterize amino acid polymorphisms in sheep prion protein (prp), we analyzed the prp genes from 271 sheep of 4 breeds (khalkh, yeroo, orkhon and khangai) raised in central mongolia (tuv, uvurkhangai and selenge prefectures). a total of 16 genotypes and 8 allelic variants of the prp gene at codons 112, 136, 154 and 171 were found. at codon 171, 1.8% of the sheep had arginine/arginine (r/r) (resistant to scrapie) and 66.8% had glutamine/glutamine (q/q) (susceptible to scrapie). several yeroo ... | 2003 | 12576708 |