Abstract
(1) The distribution of succinic dehydrogenase (which probably indicates sites of utilization of carbohydrates via the tricarboxylic acid cycle) has been studied histochemically in the ciliary body of albino rabbits using blue tetrazolium. (2) The enzyme is present in the epithelium but not in the stroma. (3) The enzyme is more abundant in the anterior zone of the ciliary processes than in the posterior region and the activity appears to be of an order similar to that in the anterior region of the retina. (4) Within the ciliary epithelium activity appears to be greater in the innermost epithelial layer than in the pigment-cell layer. (5) There is also a certain amount of non-specific reducing activity in the tissue, part of which is due to endogenous succinate or succinate-producing systems.
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