In agreement with the previous report [5], the primers Pmili, which is specific for exons 18–21 (E18-21) of murine Piwil2 and was routinely used in our laboratory for the detection of “Piwil2” mRNA in pCSCs and other tumor cell lines, reproducibly amplified the “Piwil2” mRNA in the pCSC lines (Fig. 1C). The gene discussed is PIWIL2; the disease is neoplasm.