N terminus

a·mi·no-ter·mi·nal

(ă-mē'nō-ter'min-ăl),

The α-NH₂ group or the aminoacyl residue containing it at one end of a peptide or protein (usually on the left as written).

Synonym(s): NH2-terminal

N terminus

The front end of a polypeptide chain, which has a free (unattached) amine (NH2) group.

a·mi·no-ter·mi·nal

(ă-mē'nō-tĕr'mi-năl)

The α-NH₂ group or the aminoacyl residue containing it at one end of a peptide or protein (usually at left as written).