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Fig. 3. Immunocytochemical characteristics of MPII-containing cells (MPII-C). (A) Anti-MPII immunoreactive cells (MPII-C) in the intestine of a control worm. Scale bar, 50 µm. (B) Immunoreactive MPII-C showing the characteristic nucleolus (arrow). l, gut lumen. Scale bar, 10 µm. (C) Immunoreactive cells (arrow) in the intestine of the sipunculid Sipunculus nudus. l, gut lumen; ep, epithelium; m, muscles. Scale bar, 50 µm.