T-47D cells are a human breast cancer cell line commonly used as an in vitro model for studying breast cancer biology and drug responses. These cells are estrogen receptor-positive and are useful for investigating hormone-dependent growth and signaling pathways., The available information includes the passage number (P#), quantity (10^6 live cells), contact person, and date. These details are crucial for maintaining consistent experimental conditions and tracking the cell line's history. The note indicates that the cells were obtained from ATCC (American Type Culture Collection), a reputable source for authenticated cell lines.