previous studies on the elastogenic differentiation of these cells in vitro demonstrated that the extracellular matrix ( ecm ) protein elastin was specifically induced in undifferentiated fibroblasts when they were grown on ligament ecm isolated from animals at later stages of development ( mecham , r.p. , madaras , j.g. , and senior , r.m. , 1984 .
C0079323
extracellular matrix
C0015350
ecm