Abstract
Abstract 1. 1. The three jelly coat layers of Xenopus laevis eggs were manually isolated and the proteins of each coat electrophoretically resolved; each layer contains a major protein of unique electrophoretic mobility. 2. 2. Immunological and electrophoretic analysis of stored and newly synthesised oviduct proteins suggested that the oviduct is the site of synthesis of the major egg jelly coat proteins. 3. 3. Immunological cross-reactivity among the three jelly coat related oviduct proteins suggested that they share common peptide or carbohydrate determinants. 4. 4. Evidence in this and the following paper (James et al. , 1984) suggests that the synthesis of egg jelly coat proteins in the oviduct is regulated by oestrogen.
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