N-Terminal Amino-Acid Residue - an overview | ScienceDirect Topics
Amino acid - Wikipedia
Amino-Acid Residue - an overview | ScienceDirect Topics
Structural Chemistry of Peptides Containing Backbone Expanded Amino Acid Residues: Conformational Features of β, γ, and Hybrid Peptides | Chemical Reviews
Solved 9. (2 points) Identifying Amino Acid Residues in a | Chegg.com
Monoisotopic Residue Masses of Amino Acids | Download Table
What is the meaning of the number beside amino acid residue names? - Quora