myoblast cell line skeletal muscle cell line L-6 myoblast cell BTO:0002809 BrendaTissueOBO L-6 cell L-6 myoblast cell line L6 cell L6 myoblast L6 myoblast cell Rattus norvegicus skeletal muscle myoblast cell line. The L6 myogenic line was isolated from primary cultures of rat thigh muscle maintained for the first two passages in the presence of methyl cholanthrene.