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Fig. 3: grazing view of macronuclear envelope pores

Grazing thin section through the nuclear envelope of a macronucleus. Nuclear pores are packed so tightly that they often form a hexagonal array with 6 pores surrounding a central pore. The pores often have electron opaque dots (arrows) in their centers which indicate passage of ribonucleoprotein particles (RNP) between the nucleus and the cytoplasm. EM taken on 1/4/82 by R. Allen with Hitachi HU11A TEM. Neg. 17,500X. Bar = 0.2µm.
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