The function of FOXJ2 (forkhead box J2, ENSG00000065970) is as follows. [Isoform FOXJ2.L]: Transcriptional activator. Able to bind to two different type of DNA binding sites. More effective than isoform FOXJ2.S in transcriptional activation (PubMed:10777590, PubMed:10966786). Plays an important role in spermatogenesis, especially in spermatocyte meiosis (By similarity). {ECO:0000250|UniProtKB:Q9ES18, ECO:0000269|PubMed:10777590, ECO:0000269|PubMed:10966786}. [Isoform FOXJ2.S]: Transcriptional activator. .