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An example of α-amino acid not present in proteins but essential in mammalian metabolism is 

(A) 3-Amino 3-hydroxypropanoic acid 

(B) 2-Amino 3-hydroxybutanoic acid 

(C) 2-Amino 4-mercaptobutanoic acid 

(D) 2-Amino 3-mercaptopropanoic acid


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(C) 2-Amino 4-mercaptobutanoic acid

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