关岭牛朊蛋白基因23 bp和12 bp插入/缺失的多态性及其对牛海绵状脑病抗性的影响

Polymorphism of 23 bp and 12 bp Insertion/Deletion of the Guanling Cattle Prion Protein Gene and Its Effect on the Resistance to Bovine Spongiform Encephalopathy

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