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Radial arm displaying two rows of openings from the smooth spongiome (ss) into the collecting canal (cc). Two microtubules (mt) separate the two rows of openings (arrows). The smooth spongiome forms a thick coat of membrane tubules around the canal and outside this is a reduced number of decorated spongiome (ds) tubules. EM taken on 2/28/80 by R. Allen with Hitachi HU11A TEM. Neg. 12,250X. Bar = 0.5µm. |
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