Actins/chemistry; Actomyosin/chemistry; Adenosine Triphosphate/metabolism; Avian Proteins/chemistry; Cytoskeleton/chemistry; Membrane Proteins/chemistry; Microfilament Proteins/chemistry; Smooth Muscle Myosins/chemistry; Actins/metabolism; Actins/ultrastructure; Actomyosin/metabolism; Actomyosin/ultrastructure; Animals; Avian Proteins/isolation & purification; Avian Proteins/metabolism; Avian Proteins/ultrastructure; Cytoskeleton/metabolism; Cytoskeleton/ultrastructure; Gizzard, Avian; Kinetics; Membrane Proteins/isolation & purification; Membrane Proteins/metabolism; Membrane Proteins/ultrastructure; Microfilament Proteins/isolation & purification; Microfilament Proteins/metabolism; Microfilament Proteins/ultrastructure; Microscopy, Electron, Transmission; Muscle, Smooth/metabolism; Myosin Subfragments/chemistry; Myosin Subfragments/isolation & purification; Myosin Subfragments/metabolism; Myosin Subfragments/ultrastructure; Protein Stability; Rabbits; Secretory Vesicles/metabolism; Secretory Vesicles/ultrastructure; Smooth Muscle Myosins/isolation & purification; Smooth Muscle Myosins/metabolism; Smooth Muscle Myosins/ultrastructure; Turkeys