May play an important role for the maintenance of myelin-axon integrity (PubMed:31199454). May affect intracellular Ca(2+) homeostasis. Microtubule inner protein (MIP) part of the dynein-decorated doublet microtubules (DMTs) in cilia axoneme, which is required for motile cilia beating (By similarity). May play an important role for the maintenance of myelin-axon integrity (PubMed:31199454). May affect intracellular Ca(2+) homeostasis (By similarity). Predominantly expressed in nervous system tissues, such as the spinal cord, cerebrum, cerebellum, and sciatic nerve.