[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). ; [Isoform FOXJ2.S]: Transcriptional activator.