Summary Catalase zymograms performed on hemolysates of horse red cells revealed three phenotypes each composed of a single zone of activity designated F, M and S in decreasing order of migration towards the anode. It is proposed that these phenotypes are controlled by a pair of alleles, Cat F and Cat S , such that the genotypes Cat F Cat F , Cat F Cat S and Cat S Cat S give rise respectively to phenotypes F, M and S. The effects of storage, heat, UV light and selected reagents on these phenotypes are discussed.
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Kelly et al. (1971) studied this question.