Abstract
Summary
Quantitative cytological chemical analyses of the nucleoprotein composition of the macro- and micronuclei of a clone of P. caudatum show that both nuclei contain protein, RNA and DNA in the ratio of 20:2:1. Twice as much RNA as DNA was found. From their resemblances to the nucleoprotein contents of metabolic metazoan nuclei, it is concluded that in the vegetative stage, both nuclei of P. caudatum are actively metabolic.
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