Actin Cytoskeleton/metabolism; Actins/genetics; DNA-Binding Proteins/metabolism; Drosophila Proteins/metabolism; Drosophila melanogaster/genetics; Flight, Animal; Gene Expression Regulation, Developmental; Muscle Development/genetics; Transcription Factors/metabolism; Actin Cytoskeleton/ultrastructure; Actins/metabolism; Animals; Cell Nucleus; Drosophila melanogaster/ultrastructure; Enhancer Elements, Genetic/genetics; Muscle Proteins/genetics; Muscle Proteins/metabolism; Muscles/metabolism; Muscles/pathology; Muscles/ultrastructure; Mutation; Myofibrils/metabolism; Myofibrils/ultrastructure; Myosin Heavy Chains/genetics; Phenotype; Protein Isoforms/metabolism; Protein Transport; Pupa/growth & development; Pupa/metabolism; RNA, Messenger/genetics; RNA, Messenger/metabolism; Repressor Proteins/genetics; Repressor Proteins/metabolism; Transcription, Genetic