RASSF6 and leukemia: Whilst RT-PCR showed RASSF6 was expressed in all normal tissues analysed including bone marrow (see Additional file 1; figure S4A), and in the unmethylated leukaemia cell line U937 (figure 1D and Additional file 1; figure S4B), we observed absent or downregulated expression of RASSF6 in methylated leukaemia cell lines.