human mammary epithelial cells were derived from a reduction mammoplasty ( 184 ) , immortalized by benzo-a-pyrene ( 184a 1n4 ) , and further transformed by the oncogenes simian virus 40 t ( sv40 t ) , v-ha-ras , and v-mos alone or in combination using retroviral vectors .
C0006141
mammary
C0191922
reduction mammoplasty