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When trichocysts are triggered to discharge their contents the body
of the trichocyst expands 8 or 9 times into a long needle like
filament, however, the trichocyst tip does not change shape. The
trichocyst membrane (arrow) remains behind and the plasma
membrane quickly reseals over the pellicular ridge (see Knoll, Braun
and Plattner, J. Cell Biol. 133:1295-1304, 1991.) This cell was in day
5 of a culture age study. mt, microtubules. EM taken on 3/3/80
by R. Allen with Hitachi HU11A TEM. Neg. 8,500X. Bar = 0.5µm.
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