The function of CFAP126 (cilia and flagella associated protein 126, ENSG00000188931) is as follows. Microtubule inner protein (MIP) part of the dynein-decorated doublet microtubules (DMTs) in cilia axoneme (PubMed:36191189). Acts as a regulator of cilium basal body docking and positioning in mono- and multiciliated cells (By similarity). Regulates basal body docking and cilia formation in multiciliated lung cells (By similarity). Regulates kinocilium positioning and stereocilia bundle morphogenesis in the inner ear (By similarity). {ECO:0000250|UniProtKB:Q6P8X9, ECO:0000269|PubMed:36191189}.