Involved in phototaxis. Required for coupling photodetection to the locomotory machinery of slugs. May be essential in the natural environment for the propagation of spores. Interacts with rasD and abpC. Expression is tightly regulated. Barely present in vegetative cells and peaks at the transition to the multicellular pseudoplasmodial stage of development. Severe defect in the ability of slugs to orient properly towards the light. Belongs to the villin/gelsolin family.