SarcomeresMyofibrilsConnectinPsoas MusclesMuscle ProteinsMusclesActininMuscle, StriatedMuscle ContractionMuscle, SkeletalMuscle Fibers, SkeletalTropomodulinMyosinsMyocardiumActin CytoskeletonIsotonic ContractionMicroscopy, ElectronMuscle DevelopmentIsometric ContractionRana temporariaElasticityMyocytes, CardiacBiomechanical PhenomenaDesminMyocardial ContractionTropomyosinActinsRabbitsStress, MechanicalHeartProtein KinasesAnuraMicromanipulationMuscular DiseasesCalciumMyosin Heavy ChainsFlight, AnimalLIM Domain ProteinsImmobilizationMicroscopy, ImmunoelectronMuscle CellsCells, CulturedNeedlesMicroscopyStress FibersModels, BiologicalMuscle SpindlesMicroscopy, Phase-ContrastSarcolemmaTime FactorsBiophysical PhenomenaMicrofilament ProteinsMicroscopy, FluorescenceLasersFluorescent Antibody TechniqueBiophysicsMuscle RelaxationProtein IsoformsAnimals, NewbornSarcoplasmic ReticulumCytoskeletonChick EmbryoChickens