One of the mysteries of the English language finally explained.
The free carboxyl group at one end of a peptide chain; the end of a peptide chain that terminates in a free carboxyl group, rather than in an amino group; contrasted with "amino terminus".
1960s; earliest use found in Proceedings of the National Academy of Sciences of the United States of America.
carboxy terminus/kɑːˌbɒksɪ ˈtəːmɪnəs//kɑːˈbɒksɪ ˌtəːmɪnəs/
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