The appearance of a functional contractile apparatus in developing muscle.
D000251:Adenosine Triphosphatases / Q000378:metabolism; D000818:Animals; D002118:Calcium / Q000378:metabolism; D002127:Calcium Isotopes; D002642:Chick Embryo; D004721:Endoplasmic Reticulum; D008931:Mitochondria, Muscle / Q000201:enzymology; D009119:Muscle Contraction; D009124:Muscle Proteins / Q000378:metabolism*; D009132:Muscles / Q000196:embryology* / Q000378:metabolism; D009210:Myofibrils; D011485:Protein Binding; D013997:Time Factors
D002127:Calcium Isotopes; D009124:Muscle Proteins; D000251:Adenosine Triphosphatases; D002118:Calcium