PIWIL2 and neoplasm: To further verify the existence of PL2L60 mRNAs (amRNA of PIWIL2), we examined the expression of PL2L60 proteins after knockdown of putative PL2L60 mRNAs in human tumor cell lines, using the siE21 siRNAs, which targeted exon 21 of PIWIL2, PL2L80 and PL2L60 transcripts.