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4. The following question are based on the following proteins: A TB TC DE 40 80 200 100 6 17 Protein Mr (KD) a. list first to the last that eluted out from a size exclusion column the proteins in the order of b. list the proteins in the order of first to the last that eluted out from a cation exchanger column Predict the relative position of the proteins if they are subjected to SDS-PAGe the in C. following figure d. Draw relative positions of the proteins after the mixture of the four proteins applied to two dimensional gel electrophoresis: isoelectric is in the x is applied in the y-axis. pH 3 4 5 6 7 8 9 10 A+B+C+D Extra credit: Draw the structure of SDS.