The study covered 97 Japanese quails of various genotypes of the protein referred to as preactin (PAK). The birds of AA genotype had a single, intensively stained, fastmigrating band; the BB genotypes had a single, slowmigrating, also intensively stained band, whereas the AB birds had two bands. The protein concentration, established basing on the area and height of peaks, was significantly higher in the BB homozygotes than in the AA ones, which appeared also in the form of more intensive staining of the slowmigrating band than that of the fastmigrating band of the AB heterozygotes. The differences, however, were insignificant. The protein level of heterozygotes in the subregion, calculated as the sum of two bands, was more than 50% higher than in either of the homozygous forms. The differences, confirmed statistically, can demonstrate that the genotype determining the proteins influences the expression of the genes coding particular proteins.
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