The function of ENSG00000173557 (CIMIP2C, ciliary microtubule inner protein 2C) is as follows. Microtubule inner protein (MIP) part of the dynein-decorated doublet microtubules (DMTs) in cilia axoneme, which is required for motile cilia beating (PubMed:36191189). Binds to the intra-tubulin interfaces (By similarity). {ECO:0000250|UniProtKB:Q9DAS2, ECO:0000269|PubMed:36191189}.