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Nitric oxide is formed from which of the amino acid?

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Nitric oxide is formed from which of the amino acid?

(a) L-lysine

(b) R-lysine

(c) R-arginine

(d) L-arginine

I got this question in homework.

This intriguing question comes from Cell Signaling and Signal Transduction topic in chapter Cell Signaling and Signal Transduction of Cell Biology

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Right answer is (d) L-arginine

To explain I would say: Nitric oxide is formed from the amino acid L-arginine in a reaction catalyzed by nitric oxide synthase (NOS) that requires oxygen and NADPH. Nitric oxide is involved in many biological processes.

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