The results оf а twо-dimensiоnаl gel electrophoresis sepаration are shown below. The vertical axis represents SDS-PAGE separation (top to bottom), and the horizontal axis represents isoelectric focusing with a pH gradient running from left (high pH) to right (low pH). Assuming the chromatography is performed at pH 7.0, in what order would the proteins elute from a cation-exchange chromatography column (a negatively charged resin that binds positively charged proteins)?