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| Single microtubules (arrowhead) also extend into the cytoplasm from the tips of the cytoproct ridge (arrow). These are thought to come to lie along the surface of the approaching DV-IV and to pull the ridge down against the DV-IV and to permit the plasma membrane at the crest of the ridge to fuse with the tubular extensions of the DV-IV. (Published and discussed in Allen and Wolf, J. Cell Sci. 14:611-631, 1974). EM taken on 6/1/73 by R. Allen with Hitachi HU11A TEM. Neg. 18,500X. Bar = 0.25µm. |
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