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Figure 8


Fig. 8. Dopamine stimulation causes secretory vesicle loss and appearance of vacuoles. Cyprids were fixed at different times during exposure to dopamine (1 mmol l–1) and sectioned. Sections were stained with Toluidine Blue, and the different types of vesicles in the stained sections were counted under the microscope. Note that dense-core granules (type 1) reduce in number over time, with a proportionate increase in the number of vacuoles (type 4) after 10 min of dopamine treatment.





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