BASP1 and chronic myelogenous leukemia, BCR-ABL1 positive: Chronic myelogenous leukaemia K562 cells do not express endogenous BASP1 and we utilised previously described K562 stable cell line derivatives that contain either pcDNA3 (V-K562) or pcDNA3 driving expression of BASP1 that contains a C-terminal HA tag (B-K562).18 Nuclear extracts were prepared from V-K562 and B-K562 cells and immunoprecipitation was performed with anti-HA antibodies.