N-terminus
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https://doi.org/10.1351/goldbook.09754
The end of an amino acid chain (protein or polypeptide), terminating in a free primary amine group.
Source:
PAC, 2018,
90
, 1121. 'Terminology of bioanalytical methods (IUPAC Recommendations 2018)' on page 1157 (https://doi.org/10.1515/pac-2016-1120)