Which element is present in all proteins, but not necessarily in fats or carbohydrates

Nitrogen is the key element in proteins and amino acids. It is (in most cases) not present in carbohydrates and fats. Nitrogen is the key element in proteins and amino acids. It is (in most cases) not present in carbohydrates and fats.

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c-reactive protein (crp) is an acute phase protein belonging to pentraxin family of proteins, whose levels increases 1000-fold or more in concentration in blood during the occurrence of an injury, inflammation or tissue death.