"The controlled expression of one cellular feature -- the cilium -- was likely critical during early animal evolution. Two key transcription factors, RFX and FoxJ1, coordinate ciliogenesis in animals but are absent from the genomes of most other ciliated eukaryotes, raising the question of how the transcriptional regulation of ciliogenesis has evolved."
@madamscientist Thanks for the comment, I think that's a great hashtag (note to self, need to start following hashtags on this site).