Unknown, due to the absence of a functional motor domain. Detected in brain, stomach and kidney. Belongs to the TRAFAC class myosin-kinesin ATPase superfamily. Myosin family. Was thought be the product of a pseudogene due to the substitution or deletion of many conserved amino acids in the motor domain. However it has been observed with several high-quality proteotypic peptides in several independent proteomic studies. Represents an unconventional myosin. This protein should not be confused with the conventional myosin-15 (MYH15). Extended N-terminus.