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19-pmnu800306-35

Fig. 19: stationary phase cell with disintegrating macronucleus

In a 9-day old culture of stationary phase cells, two or three days post-conjugation, remnants of the previous macronucleus (mac) could be found near normal macronuclear bodies. This remnant was identified by its nuclear envelope and a nucleolar body (no). A sparsely dispersed array of other electron-opaque bodies was present but these were far fewer than in a normal macronucleus. Presumably this body represents a breakdown product of the disintegrating macronucleus that was present before the preceding conjugation that occurred on day 6 or 7. EM taken on 3/6/80 by R. Allen with Hitachi HU11A TEM. Neg. 3,500X. Bar = 1µm.
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