Part of the dynein complex of respiratory cilia. Consists of at least two heavy chains and a number of intermediate and light chains (Probable). Interacts with DNAAF2 (PubMed:19052621). Interacts with DNAAF6/PIH1D3 (PubMed:24421334). Interacts with HEATR2; probably involved in outer arm dynein assembly (By similarity). Located in the proximal region of respiratory cilia. Predominantly expressed in ovary, testis and lung. In ovaries, it is detected at high levels in vivo on day 10, with a subsequent decrease on days 15 and 20, in adult and old ovaries. Weakly expressed on day 5. Belongs to the dynein intermediate chain family.