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   ocr: relatives living throughout the tropical rainforest in lower Central America and northern South America. Much of the basic research on tropical poison frogs and related frogs of the Family Dendrobatidae has been conducted by scientists in the Department of Herpetology at the American Museum of Natural History in collaboration with colleagues at the National Institutes of Health. Their work in jungle camps and modern laboratories has RAe led to the discovery of dozens of new species of frogs and over three hundred new alkaloids from frog skin. Alkaloids are a class of organic nitrogen compounds ...