Abstract
THE GENETIC CONTROL of the quantitative activity of a serum enzyme was first suggested by Augustinsson and Olsson with serum arylesterase (aryl ester hydrolase [International Union of Biochemistry 3.1.1.2] ) 1 in Swedish Landrace swine. 2 However, the authors are unaware of a report of hereditary control of the quantitative activity of a serum enzyme in man although several examples of qualitative differences exist. 3 These qualitative differences of the gene may result, of course, in gross changes in the quantitative activity of an enzyme as it acts upon a substrate. However, they do not express themselves as continuous quantitative changes in phenotype over a normal range of enzyme activity. Such qualitative differences of serum cholinesterase (acylcholine acyl-hydrolase [IUB 3.1.1.8] ) 4 in man involve the atypical serum cholinesterase first described by Kalow, 3 the C 5 extra component which is most likely nonallelic with respect to the atypical gene 5 a
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