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| In addition to plates the plasma membrane contains IMPs on its P-fracture face in ring or parenthesis shape at sites of trichocyst secretion. A ring actually consists of two circles of IMPs and signifies that a trichocyst is docked underneath while a parenthesis means the site has no docked trichocyst. The fracture also exposed some of the E-face of the outer alveolar membrane (oam) which is relatively free of IMPs. EM taken on 6/4/90 by R. Allen with Zeiss 10A TEM. Neg. 19,800X. Bar = 0.25µm. |
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