ML-1 is one of three celll lines isolated in 1978 from the peripheral blood of a 24 year old male patient with acute myeloblastic leukaemia. The cells can convert to more mature cells by the use of DMSO. The Y chromosome could not be detected in this cell line by short tandem repeat (STR)-PCR analysis. It is a known phenomenon that due to the increased genetic instability of cancer cell lines the Y chromosome can be rearranged or lost resulting in lack of detection. The cell line is identical to the source provided by the depositor based on the STR-PCR analysis.