PPP1R13L and leukemia: Consistent with the mRNA and immunohistochemistry results, a significant increase in mean iASPP protein expression levels was detected in the leukemia cohort compared to healthy donors (Fig. 1D) – whereas there was no difference in iASPP expression levels of leukemic blasts from bone marrow aspirates when compared to leukemic blasts isolated from peripheral blood (Fig. 1E).