This family includes the radial spoke head proteins RSP4 and RSP6 from Chlamydomonas reinhardtii, and several eukaryotic homologues, including mammalian RSHL1, the protein product of a familial ciliary dyskinesia candidate gene [1].

1: A mammalian radial spokehead-like gene, RSHL1, at the myotonic dystrophy-1 locus. Eriksson M, Ansved T, Anvret M, Carey N; Biochem Biophys Res Commun 2001;281:835-841. PMID:11237735