New variants of Ps salivary polymorphic proteins

Electrophoretic analysis of the Ps protein demonstrated the existence of phenotypes additional to those described by Azen & Denniston (1980). A hypothesis that the polymorphism of the Ps protein is determined by five expressed and one unexpressed alleles was supported by family studies. The gene frequencies in a Japanese population were Ps ^1F= 0.0016, Ps ¹= 0.2983, Ps ^2F= 0.0288, Ps ^2S= 0.0079, Ps ³= 0.0111, Ps ⁰= 0.6523.