1. Kollonitsch, J., Barash, L., and Doldouras, G. A., J. Amer. Chem. Soc., 92, 7494 (1970).
2. Kollonitsch, J., Barash, L., and Doldouras, G. A., 162nd Meeting of the Amer. Chem. Soc., Abst. F19 (Washington, 1971).
3. Goldman, P., Science, 164, 1123 (1969).
4. Rogers, H. J., and Perkins, H. R., Cell Walls and Membranes, 214, 220, 261 (Spon Ltd, London, 1968).
5. Corrigan, J. J., Science, 164, 142 (1969).