has part has part composed primarily of slow muscle cell skeletal muscle tissue slow muscle tissue UBERON:0006907 UMLS:C0242874 BTO:0002317 check if CALOHA term is for fiber or tissue. CALOHA:TS-0940 slow-twitch skeletal muscle The darker-colored muscle tissue of some mammals, composed of slow twitch muscle fibers. red muscle check if relationship to cell types should be more specific type I cells The fast and slow skeletal muscles are different in terms of twitching speed (Fitts 1994), and they are believed to be derived from distinct myogenic precursors (Stockdale 1992) NCIT:C12614 slow muscle slow skeletal muscle tissue