Fig. (4) Relative trypsin Resistance of NSP4ΔN72 proteins from different strains. The relative resistance to trypsin of the region from residue 72-146 among the different ΔN72 peptides is indicated on a scale of 0-100. M, Top two panels- Prestained MW markers (Biorad), bottom three panels- Low MW range markers (GIBCO-BRL).