Amino acids Binding Sites Binding sites Bins Biochemistry Biological properties Bovine pancreatic ribonuclease Carbon Monoxide Circular Dichroism Crystallography Crystallography, X-Ray Dichroism Iridium Mass Spectrometry Mass spectrometry Model proteins Molecular Structure Molecules N-terminals Protein Binding Protein targets Protein-binding sites Proteins Raman microspectroscopy Raman spectrometry Side-chains Spectrum Analysis, Raman X ray crystallography binding site carbon monoxide