Antibodies, Monoclonal|Cell Line|Computer Simulation|Epithelial Cells|ErbB Receptors|Humans|MAP Kinase Signaling System|Mammary Glands, Human|Mitogen-Activated Protein Kinases|Models, Biological|Phosphorylation|Proto-Oncogene Proteins c-akt|Receptor, ErbB-2|Receptor, ErbB-3|Reproducibility of Results