BRCA1 and neoplasm: We thank Drs. Norman Sharpless, Beverly Koller, Chuxia Deng, and Lothar Hennighausen for p16,Brca1 mutant and MMTV-cre mice, Ergonul A. Burcu for discussion on tumor pathology, the FACS core facility at University of Miami for cell sorting, the DVR core facility for animal husbandry.