Abstract
1. 1. Comparison between pig atrial and ventricular myosins was performed on the light chains (using SDS-PAGE) and on the heavy chains (using Ca 2+-ATPase measurements and NTCBA peptide mapping). 2. 2. Light chain composition of pig cardiac myosins was compared to three other species ones (frog, chicken and human). 3. 3. Up to birds, atrial and ventricular myosin light chain composition was identical whereas in mammals atrial and ventricular myosin light chain composition was different; likewise the heavy chains. 4. 4. Six cardiac myosin isoenzymes have been thus characterized. 5. 5. No correlation can be established between cardiac myosin light chain pattern and species evolution.
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