selenium , at 5 x 10 ( -8 ) m , stimulated the growth of primary cell cultures of normal mammary cells and c4 preneoplastic cells and the established cell line yn-4 , but not the growth of d2 preneoplastic cells and tumors in primary cell cultures and of established cell lines cl-s1 and waz-2t .
C0007634
cells
C0007595
growth of