Drosophila melanogaster, contraction, electron microscopy, motility, myofibril, Actins, Animals, Cardiomyopathy, Restrictive, Drosophila melanogaster, Flight, Animal, Muscle Contraction, Muscle, Skeletal, Mutation, Myocardium, Myofibrils, Myosin Heavy Chains, Myosin Subfragments, Myosins, Phenotype, Proline