Predicted to enable ATP hydrolysis activity; microtubule binding activity; and microtubule motor activity. Predicted to be involved in microtubule-based movement. Predicted to be part of kinesin complex. Predicted to be active in cytoplasm and microtubule. Is expressed in organism. Human ortholog(s) of this gene implicated in congenital fibrosis of the extraocular muscles 1. Orthologous to human KIF21A (kinesin family member 21A) and KIF21B (kinesin family member 21B).