Expression of the Orphan Nuclear Receptor NR4A in a Putative Adenohypophyseal Homologue of Amphioxus

Nur77, Nurr1, and NOR-1 form a subfamily (the NR4A/Nur subfamily) of transcription factors belonging to the family of nuclear receptors. In this report, we characterized the single member of such a subfamily in the amphioxus Branchiostoma floridae. Developmental expression analysis of AmphiNR4A showed transcripts limited to the putative adenohypophyseal homologue of amphioxus.