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By Harris Busch (Eds.)
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Additional resources for The Cell Nucleus. Volume 1
Localization of Nuclear Functions 27 fixed granulocytes Smetana et al. (1971b) recently confirmed these early studies. The 15-30-Â thick filaments that they described as embedding the ICG were digested by pepsin alone, while pepsin followed by RNase extracted the I C G as well. In contrast with these results, Swift (1962) had noticed the resistance of ICG to nucleases and perchloric acid extraction at 40° on fixed, frozen sections of rat liver. With direct action of the enzymes on ascites cells he confirmed this RNase resistance (Swift, 1963).
Conclusion. Except for the data provided by the E D T A technique no demonstration has been given that PCG contain RNA, at least under a form which would allow detection by means of enzymatic digestions. Since they are also too small to permit an E M ARG analysis of individual granules it is impossible to determine whether they incor3 porate [ H]UdR. On the other hand, their perichromatin location, where newly formed RNA is probably also found (see Section IV,B,2), their similarity with Balbiani granules, and the drug-induced alterations all argue for the assumption that they contain extranucleolar RNA.
From investigations on replication throughout the cell cycle it would appear that replication takes place in the diffuse chromatin during the early S phase and also in the periphery of the nucleus in the late S phase. A higher concentration of labeling is observed occasionally at the periphery of the nucleus, but this is likely to reflect only the higher density of the chromatin at this place. , 1972), but not all (see Fakan et al, 1972), biochemical studies support this hypothesis. As for the nucleolus, the nucleolar-associated chromatin is a site of 3 [ H ] T d R incorporation.