Abstract
ABSTRACT The principal islet of the cod consists of a central mass of endocrine tissue, surrounded by a capsule of exocrine tissue. Four cell types are recognisable by differential staining and electron microscopy. Three of these correspond in staining reactions and general morphology to alpha, beta and delta cells of other species. Each cell-type contains characteristic secretory granules. The fourth cell-type does not appear to correspond to any other pancreatic endocrine cell although its granules show features common to both alpha and beta cells. It may represent a phase in the life history of one of these cell types or more probably a separate cell-type.
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