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Fig. 7: micronucleus

Like other ciliates two types of nuclei are present. A germinative micronucleus (mic) and a RNA-producing macronucleus (mac). Both have nuclear envelopes with pores (arrows) and both have ribosomes attached to their outer membranes. Heterochromatin bodies are the only prominently stained entities in the micronucleus. A few microtubules (arrowheads) are also present. EM taken on 3/29/71 by R. Allen with Hitachi HU11A TEM. Mag. 13.750X. Bar = 0.5µm.
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