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| The macronucleus of Tetrahymena is polyploidal containing many copies of the genome. Chromatin material (ch) is found as condensed electron opaque spots as well as in an uncondensed form between the opaque spots. The macronucleus, unlike the micronucleus, contains many nucleoli (no) that tend to accumulate next to the nuclear envelope (ne). Nucleoli are sites of ribosomal RNA synthesis and ribosome subunit assembly. EM taken on 8/14/67 by R. Allen with Philips 200 TEM. Neg. 4,500X. Bar = 1µm. |
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