Protein: nf A protein (from the Greek “protos” which means “main substance”) is a nitrogenous organic compound and an essential constituent of any living cell. Proteins, or protides, are giant molecules made from twenty basic amino acids, eight of which are not produced by the body.
These substances contain nitrogen, a gas of which the body consumes a great deal; they are present throughout the body, in all living cells. The proteins...
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