Salmon Calcitonin-Like Immunoactivity in Extracts of Tetrahymena Pyriformis

Abstract
Acid extracts of Tetrahymena pyriformis, a ciliated protozoan grown in defined medium revealed the presence of materials with salmon-type calcitonin immunoactivity. These findings add support to earlier reports of the presence of materials closely resembling vertebrate peptide hormones in unicellular microbes.

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