sulfate-radiolabeled proteoglycans ( pg ) have been characterized from the tissue culture substratum adhesion sites of two human dermal fibroblast subpopulations , papillary ( pap ) or reticular ( ret ) , to determine the consequences of aging of these cells either in vivo or in vitro upon properties of these cells : matrix interfacing molecules .
C0016030
fibroblast
C0007634
cells