n-2- ( 4-t-butylphenoxy ) ethyl-n'-chloroethyl-n'-nitrosourea ( bpe-nu ) , a control compound which contains the nitrosourea moiety but does not bind to the estrogen receptor , had no effect on cell proliferation or colony formation in mcf-7 cells , but was very inhibitory in the receptor-negative mda-mb-231 cells .
C0034804
estrogen
C0596290
cell proliferation