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Fig. 2. Ultrastructure of the ectodermal muscle in a subumbrellar segment. Both A
and B are radial sections, with the radial muscle (RM) cut longitudinally and
the circular (swim) muscle (CM) in cross section. Note that the radial muscle
cells are superficial to the circular muscle. In both A and B, neurites (N)
are present, and contain dense core vesicles. The neurite in A is superficial
to the radial muscle, whereas the neurite in B is between the radial and
circular muscle processes. In both panels, the subumbrellar cavity is to the
top left.
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