Expressed in activated stem cells, such as mobilized CD34+ cells and cord blood CD34+ cells, but not in resting bone marrow CD34+ cells. Expressed in a variety of neoplastic cell lines, mainly in prostatic adenocarcinoma cell lines. Not expressed in normal prostatic tissue. Belongs to the ANP32 family. The His-140 polymorphism is uncertain. It has been found in prostatic cell line without corresponding normal tissue sample. Cells transfected with this variant expressed at least twice as much proteins than native cells.