1. Noell, W. K., Walker, V. S., Kang, B. S. and Berman, S. (1966) Invest. Ophthal. 5, 450–473.
2. Adams, D. O., Beatrice, E. S. and Bedell, R. B. (1972) Science 177, 58–60.
3. Ts’o, M. O. M. (1973) Invest. Ophthal. 12, 17–34.
4. Marshall, J., Mellerio, J. and Palmer, D. A. (1972) Expt’l. Eye Res. 14, 164–169.
5. Lawwill, T. (1973) Invest. Ophthal. 12, 45–51.