Probable metal transporter. The interaction with the metal ion chaperone COX11 suggests that it may play a role in sensory neuron functions (By similarity). May play a role in biomineralization and retinal function. Interacts with COX11. Cornea, retina, teeth (at protein level). In the retina it is predominantly localized to the outer plexiform layer, inner plexiform layer and ganglion cell layer. In the tooth strongest expression is observed in the cell body of the ameloblasts. Expressed at high levels in the gastrointestinal tract and testis. Shares weak sequence similarity with the cyclin family, hence its name. However, it has no cyclin-like function in vivo. Belongs to the ACDP family. Truncated N-terminus. Extended N-terminus.