Adherence to either fibronectin or collagen-coated plastic had little consistent effect on PDGF ( B ) mRNA accumulation .
adherence to either fibronectin or collagen-coated plastic had little consistent effect on pdgf ( b ) mrna accumulation .
O O O O O O O O O O O O B-protein_subunit I-protein_subunit I-protein_subunit I-protein_subunit O O O