Field Properties of the Developing Frog's Egg.

protyrosinase seems to change into tyrosinase under the same conditions that favor the aggregation of the long chain ions into micelles composed of these ions. The latter conditions are discussed in terms of the prevailing concentration of ordinary electrolytes in the protyrosinase-tyrosinase reaction medium. It is hoped that this study will lead to the future elucidation of the mechanism for the activation of protyrosinase.