Force generating protein required for cilia beating in respiratory epithelia (PubMed:30471717, PubMed:30471718). Produces force towards the minus ends of microtubules (PubMed:30471717, PubMed:30471718). Key component of dynein, a family of motor proteins essential for movement along microtubules (By similarity). Dynein has ATPase activity; the force-producing power stroke is thought to occur on release of ADP (PubMed:30471717, PubMed:30471718). Required for structural and functional integrity of cilia (PubMed:30471717, PubMed:30471718). {ECO:0000250|UniProtKB:I7M9J2, ECO:0000269|PubMed:30471717, ECO:0000269|PubMed:30471718}. This is the function of DNAH9 (dynein axonemal heavy chain 9, ENSG00000007174).