Urea. Molecular model of the organic compound urea (C.H4.N2.O), which plays an important role in the metabolism of nitrogen-containing compounds. It is the main nitrogen-containing substance in the urine of mammals. Atoms are represented as spheres and are colour-coded: carbon (grey), hydrogen (white), nitrogen (blue) and oxygen (red). Illustration. | |
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Crédit: | Science Photo Library / Laguna Design |
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