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Which of the following statements is incorrect? A. The E1 enzyme from yeast can work with E2 and E3 enzymes from human. B. The number of E1-E2-E3 combination in a cell is large. C. All ubiquitination reaction involves in the formation of an E2-Ub conjugate. D. E3 enzymes are involved in recognizing the substrate (the protein to be ubiquitinated).
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