Probable metal transporter. The interaction with the metal ion chaperone COX11 suggests that it may play a role in sensory neuron functions. May play a role in biomineralization and retinal function. Interacts with COX11. Present in spinal cord dorsal horn neurons and in developing teeth (at protein level). In the tooth, higher expression is found in the ameloblasts during the transition and maturation phases of amelogenesis; reduced eypression in the odontoblasts. 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.