Abstract
1. 1. The transferrins of Xenopus laevis and Xenopus horealis are polymorphic. Electrophoresis can distinguish between the two Xenopus species. Differences in electrophoretic mobility are not explained by differences in sialic acid or iron content of the molecule; they are of genetic origin. 2. 2. X. laevis has two transferrins or one of these two. Breeding experiments between the two species support the argument that in X. laevis one locus with two autosomal codominant alleles is present. X. borealis displays two major transferrins: the two transferrins could be coded by one or two homozygous genes. 3. 3. The mol. wt of X. laevis transferrin is about 85,000.
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