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Clusters of endocrine cells that secrete two hormones directly into the circulatory system. Each islet has a population of alpha cells - which secrete the peptide hormone glucagons - and a population of beta cells - which secrete the hormone insulin.

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1. Clusters of endocrine cells that secrete two hormones directly into the circulatory system. Each islet has a population of alpha cells - which secrete the peptide hormone glucagons - and a population of beta cells - which secrete the hormone insulin.





 
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