Movie 1. Optokinetic responses (OKRs) of untreated noa and wild-type larvae at 6 days postfertilization. OKRs were performed as described (1). Wild-type larvae (Right) have a robust visual response, whereas the noa mutants (Left) show no response. The arrow indicates the direction of drum rotation.

1. Brockerhoff, S. E., Hurley, J. B., Janssen-Bienhold, U., Neuhauss, S. C., Driever, W. & Dowling, J. E. (1995) Proc. Natl. Acad. Sci. USA 92, 10545-10549.