Through the application of a specific oxidase stain to results of starch gel electrophoresis of human serum, three different electrophoretic forms of ceruloplasmin-denoted CpA (fast), CpB (intermediate), and CpC (slow)-have been defined. The electrophoretic differences are small and were first recognized through a rare variant individual who had only the fast and slow forms. Five phenotypes displaying different combinations of the three electrophoretic forms have been defined in American Negroes; these are called CpA, CpAB, CpB, CpAC, and CpBC. Twin, family, and population studies have yielded evidence indicating that the A and B electrophoretic forms are controlled by a pair of autosomal codominant alleles, designated Cp A and Cp B, and suggesting that the C form may be determined by a third allele, Cp c, at the same locus. The variants constitute a genetic polymorphism in American Negroes, but occur only rarely in Caucasians.

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The relationship between intelligence and creativity and their factorial structure have been extensively discussed, with little empirical evidence and less agreement as to the meaning. A study of 117 pairs of like sexed fraternal and identical twins was undertaken, with each twin participating in an extensive battery of creativity tests.A factor analysis indicated three factors for the fraternal twins and two for the identical twins, the results supporting both (a) the notion that the common variance of creativity measures may be accounted for by a general intelligence factor, and (b) the division of creativity into a verbal and a figural domain.