Within islets, beta cells secrete insulin, and alpha cells secrete glucagon. Scientists have identified three additional cell types in islets, including cells that secrete the hormones ...

Lee, T. H., Lerner, A. B., and Buettner-Janusch, V. (unpublished results). Li, C. H. (personal communication). Burgers, A. C. J., First Intern. Cong. Endocrinol. Abst ...

The thicker the substance, the more the radiation is absorbed. Alpha, beta and gamma radiations penetrate materials in different ways. Alpha radiation is the least penetrating. It can be stopped ...