Myosins are actin-based motor molecules with ATPase activity. Unconventional myosins serve in intracellular movements (PubMed:9819351). Regulates Rho by stimulating it's GTPase activity in neurons (PubMed:9819351). Required for the regulation of neurite branching and motor neuron axon guidance (By similarity). Localized in the cytoplasm of cell bodies, dendrites and axons with occasional hints of an enrichment near the plasma membrane. Localized at the neuromuscular junction (By similarity). Expressed at high levels in brain, followed by testis and spleen. Expressed at very low levels, in kidney. Detected abundantly in brain and testis and at lower levels in adrenal gland, kidney, lung and spleen (at protein level). In adrenal gland it is mostly found in the medulla but not in the cortex. In brain, it is found in the cerebellum and the CA2-CA3 regions of the hippocampus. Expressed at high levels in developing forebrain. This expression decreases slightly in embryonic and early postnatal days. Phosphorylated by ALPK1 following monosodium urate monohydrate (MSU)-induced inflammation. Belongs to the TRAFAC class myosin-kinesin ATPase superfamily. Myosin family. Represents an unconventional myosin. This protein should not be confused with the conventional myosin-9 (MYH9).