thus , the lower lipoprotein uptake encountered in the rat smooth muscle cells , compared to that described for human fibroblasts ( goldstein , j.l . and brown , m.s . ( 1974 ) j. biol . chem . 249 , 5153-5162 ) , could be due in part to the much lower cell density used in the latter studies , as well as to cell type and species difference .
C0016030
fibroblasts
C0007634
cell type