Once Just became an established scientist with a worldwide reputation he started concentrating on a theory that had been brewing in his mind for several years. He theorized that the outer part of the cell (the cortical cytoplasm) was more significant in vital life processes than had been previously recognized. He thought, in fact, that it was a crucial link between an animal and its environment. One way he used to show this was by showing that the fertilization of an egg was independent of how mature it was and that the cytoplasm thus became important in the fertilization process
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