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An investigation was carried out to determine general staining and histochemical properties of rat atrial specific granules. It was found that these granules may be demonstrated using aldehyde fuchsin after pretreatments which involve oxidation or thiosulfation. This new way of demonstrating atrial granules is compared to other staining methods in terms of sensitivity and selectivity as well as to the nature of reactive groups that may be involved in the staining reactions. No lipid or carbohydrate were detected histochemically. Overall assessment of reactions suggests that atrial granules are a site of storage for a protein or polypeptide. Some of the tests indicate that these may contain tryptophan and sulfur-containing amino acids.

Atrial specific granules of the rat heart: light microscopic staining and histochemical reactions.