TY - RPRT TI - The evolving concept of a stem cell: entity or function? AU - H M Blau AU - T R Brazelton AU - J M Weimann PY - 2001 DO - 10.1016/s0092-8674(01)00409-3 UR - https://pubmed.ncbi.nlm.nih.gov/11439179/ ID - 11439179 ER -