C terminal

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The carboxyl group (COOH on the right) is the C-terminus of an amino acid
The carboxyl group (COOH on the right) is the C-terminus of an amino acid

All amino acids have the C-terminus also known as the carboxyl group. This end carries a negative charge and the carbonyl group present in the amino acid is a good hydrogen bond acceptor.

The C-terminus is an end point to the protein/amino acid, conversely the N-terminus is the starting point to the protein/amino acid. 

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