May play a role in the control of meiotic division and germ cell differentiation through regulation of pairing and recombination during meiosis (By similarity). Required for sperm flagella assembly (By similarity). May play a role in the assembly and function of the outer dynein arm-docking complex (ODA-DC). ODA-DC mediates outer dynein arms (ODA) binding onto the axonemal doublet microtubules (By similarity). Able to form oligomers (By similarity). Interacts with ODAD1 (By similarity). Microtubule inner protein (MIP) part of the dynein-decorated doublet microtubules (DMTs) in cilia axoneme. Expressed in trachea multiciliated cells. Belongs to the MNS1 family.