What is "n-terminus"

alt. (context biochemistry English) The end of a polypeptide chain that consists of an amino acid with a free amino group n. (context biochemistry English) The end of a polypeptide chain that consists of an amino acid with a free amino group

The N-terminus (also known as the amino-terminus, NH-terminus, N-terminal end or amine-terminus) refers to the start of a protein or polypeptide terminated by an amino acid with a free amine group (-NH). By convention, peptide sequences are written N-terminus to C-terminus, left to right in LTR languages. This correlates the translation direction to the text direction (because when a protein is translated from messenger RNA, it is created from N-terminus to C-terminus - amino acids are added to the carbonyl end).