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Furchgott's discovery that endothelial cells produce a vasodilating substance.
A guanacaste tree, Enterolobium cyclocarpum, growing in Costa Rica. Guanacaste trees, which produce
The tiger, Panthera tigris, was historically found throughout much of Asia, but at low population de
Many countries do not produce enough food and need to import food from the United States
A fictional element named Nivadium is found to have three naturally occurring is
Ribonucleotides containing unusual nitrogenous bases are found in transfer RNA