SarcomeresMyofibrilsConnectinPsoas MusclesMuscle ProteinsMusclesActininMuscle, StriatedMuscle ContractionMuscle, SkeletalMuscle Fibers, SkeletalTropomodulinMyosinsActin CytoskeletonMyocardiumMicroscopy, ElectronIsotonic ContractionLength of StayIsometric ContractionBiomechanical PhenomenaElasticityRana temporariaMuscle DevelopmentMyocytes, CardiacMyocardial ContractionRabbitsDesminActinsStress, MechanicalTropomyosinHeartProtein KinasesAnuraMicromanipulationCalciumTime FactorsMuscular DiseasesPolymorphism, Restriction Fragment LengthMyosin Heavy ChainsFlight, AnimalModels, BiologicalImmobilizationMicroscopy, ImmunoelectronLIM Domain ProteinsCells, CulturedMuscle CellsNeedlesMicroscopyMuscle SpindlesMolecular Sequence DataBiophysical PhenomenaMicroscopy, Phase-ContrastStress FibersSarcolemmaMicroscopy, FluorescenceLasersBiophysicsMicrofilament ProteinsFluorescent Antibody TechniqueProtein IsoformsMuscle RelaxationAnimals, NewbornChickensAmino Acid SequenceCytoskeletonChick EmbryoElectric StimulationSarcoplasmic ReticulumMicroscopy, ConfocalLarvaHeart VentriclesMutation