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JBC, Vol. 252, Issue 3, 830-834, Feb, 1977

Transmission of the cytochrome c structural gene in horse-donkey crosses

O. F. Walasek and E. Margoliash

Donkey cytochrome c was shown to differ from horse cytochrome c by having a serine in position 47 rather than a threonine. The rest of the amino acid sequences are identical. Mules and hinnies, both males and females, carry equal amounts of horse and donkey cytochromes c. The same ratio is found in hinnies in preparations from heart tissue and from skeletal muscle. These results demonstrate that cytochrome c is transmitted in horse-donkey crosses as a simple Mendelian character which is neither sex-linked nor shows dominance. The cytochrome c gene is therefore located in the nuclear genome, as earlier shown to be the case for Saccharomyces iso-1-cytochrome c.
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