Certain substances which are histologically and functionally nucleins do not yield any xanthin base as a decomposition product. These are called para nucleins. Some of these are antecedents of true nu cleins. Thus, the yelk of the egg contains a para nuclein, which may be isolated by removing the accompanying proteids by peptic digestion. This sub stance does not yield a xanthin base, but during the process of incubation it develops into a true nuclein.

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