OTOR also named Otoraplin and MIAL, is a 15 kDa disulfide bonded homodimer, which is secreted via the Golgi apparatus and is a member of the MIA/OTOR family. Members of this family which also includes MIA, MIA2, and TANGO share a Src homology-3 (SH3)-like domain. OTOR is mainly expressed in the cochlea of the inner-ear and appears to be involved in early chondrogenesis of the otic capsule, which is required for normal inner ear development and auditory function. The OTOR shares high sequence identity with the mouse (90%), chicken (80%), and bullfrog (60%) orthologs and with the related human CDRAP/MIA protein (43%).