Structural difference between larval and adult cytochromes c of the horsefly, Musca domestica.

The structural difference between larval and adult cytochromes c of the housefly, Musca domestica was studied. The two cytochromes differed in electrophoretic behavior and amino acid composition from each other. Peptide maps prepared from the tryptic digests of the two cytochromes were also different from each other in several regions. Amino acid analyses of the peptides separated on the maps showed that the primary structure differed between the two cytochromes in at least 5 positions.