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Fig. 2. Appearance of the different types of secretory granules after stimulation
of cyprids with dopamine (1 mmol l1) for 10 min. Cyprids
were aldehyde fixed, sectioned and stained with Toluidine Blue. The different
types of granules are labelled (14). The cement duct, with dissolved
proteins, is seen as an extension away from the cement gland towards the
muscular sac.