Acts in combination with TSN as an endonuclease involved in the activation of the RNA-induced silencing complex (RISC). Possible role in spermatogenesis. {ECO:0000269|PubMed:12036294, ECO:0000269|PubMed:21552258}. This is the function of Ensembl gene identifier ENSG00000116918 (TSNAX, translin associated factor X).