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| Only the macronucleus (mac) contains nucleoli (no) which is the site of ribosomal RNA synthesis and ribosome subunit assembly. This EM also contains the distal end of the food vacuole forming cytopharynx (cp) which consists of a single membrane limited tube surrounded by microtubules that originate from the lamellae at the edge of the peristome (see figure 1g). fv, food vacuole. EM taken on 3/29/71 by R. Allen with Hitachi HU11A TEM. Neg. 10,250X. Bar = 0.5µm. |
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