Dry weight and 5HT concentration in the cerebral ganglia of Anodonta (Mollusca) during activity.

As shown by interferometry, the amount of protein in neuron bodies of Anodonta cygnea L. cerebral ganglia changed in direct relation to the duration of the active state of the mollusc. The amount of serotonin in cerebral ganglia changes independently of the amount of protein in nerve cells, although it varies consistently with the activity and rest of the animal.