with each cell type , there was a good correlation between the maximal levels of dna synthesis achieved by these isoforms and the numbers of the appropriate receptor present on the cell surface : hmscs , which have at least 32,000 b receptors but only 8,000 a/b receptors , responded well to pdgf-bb but responded poorly to pdgf-aa ;
C0007634
cell type
C0699040
cell surface