Abstract

Isozyme characters of creatine kinase, including the number of genes, the specificity of tissue expression, and the ability to form interlocus and intralocus heterodimers, were reevaluated for their potential for systematics applications among the reptiles. The gene number character has limited application because it is apomorphic only for chelid turtles. The intralocus heterodimer formation character has limited systematic value because of the infrequency of heterozygosity. Likewise, the interlocus heterodimer formation character has limited systematic value because of the infrequency of both Ck-A and Ck-C products being expressed in the same tissue. Differences in patterns of specificity of tissue expression hold the greatest potential for applications in reptilian systematics.

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