Probable component of the tectonic-like complex (also named MKS complex), a complex localized at the transition zone of primary cilia (Probable). Required for ciliary structure and function (By similarity). Probable component of the tectonic-like complex (also named MKS complex), composed of B9d1, B9d2, Cc2d2a, Mks1 and tctn. Localizes at the transition zone (TZ), a region between the basal body and the ciliary axoneme (PubMed:27646273, PubMed:27577095). Co-localizes with the tectonic-like complex (PubMed:27646273). Expressed in the antennae of chordotonal neurons and male germ cells (at protein level).