An unusual transferrin variant in sheep.

An unusual variant, Tf Aw, has been found in sheep transferrins. It position in starch gel electrophoresis is identical with the variant Tf A, but the intensity of corresponding bands is substantially lower. Family analyses prove that the variant Aw is genetically controlled and represents either the product of an unusual allele Tf Aw or the interaction between the allele Tf A and a hypothetical modifying locus.