Animalia 4 Animals 4 Enzyme Activation 4 Epithelial Cells 4 ErbB receptors 4 Female 4 Macromolecular Substances 4 Mammary Neoplasms, Experimental 4 Mammary tumorigenesis Medroxyprogesterone 17-Acetate 4 Mice 4 Mice, Inbred BALB C 4 Mink cell focus-forming virus 4 Oligodeoxyribonucleotides, Antisense 4 Phosphorylation 4 Progesterone Congeners 4 Progestin 4 Receptor Cross-Talk 4 Receptor, IGF Type 1 4 Receptor, erbB-2 4 Signal Transduction 4 Tumor Cells, Cultured 4 Type I insulin-like growth factor receptor 4 Tyrosine 4 animal cell 4 animal experiment 4 animal model 4 animal tissue 4 antisense oligodeoxynucleotide 4 article 4