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Fig. 9. Light microscopy of dopamine-stimulated cement glands. Cement glands were
fixed at various times during dopamine exposure, and sections were cut.
Toluidine Blue-stained sections were examined under the microscope. Note the
absence of vacuoles in the control gland (A) and the appearance of vacuoles
after 4 min exposure to dopamine (B), which increase in number after 10 min
exposure (C).