Article 1 Factor IX 1 Factor VIII 1 Isoleucine 1 Leucine 1 Models, Molecular 1 Modification degree 1 Molecular Structure 1 Polysialic acid 1 Protein Conformation 1 Proton Magnetic Resonance Spectroscopy 1 Quantitative NMR Recombinant Proteins 1 Resorcinol assay 1 Sialic Acids 1 Valine 1 assay 1 blood clotting factor 8 1 blood clotting factor 9 1 calibration 1 chemical structure 1 chemistry 1 isoleucine 1 leucine 1 measurement accuracy 1 molecular model 1 nuclear magnetic resonance spectroscopy 1 peptides and proteins 1 polymer 1 polysialic acid 1