<p>The function of this region is not clear, but it is found in many flagellar hook proteins, including FliD homologues [<cite idref="PUB00013036"/>]. This motif is found in single copy or repeated in various flagellar proteins. Conserved Ile-Asn (IN) residues are seen at the centre of the motif. The diversity of these motifs makes it likely that some members of the family are not identified.</p>