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- How might nucleophilic catalysis work?Draw out a possible mechanism.Here is the same figure as in the previous two questions, but omitting the red circles. Cys157 Cys157 Cys157 His296 His296 His296 LOH HN HN HN N? -CO2 CH2 Asn329 Asn329 Asn329- Cys157 His296 LOH HN H HyC. Asn329 Which of the following roles is played by the imidazole side chain of His296? Pick the one best [ Select ] answer.Which of the following could act as a nucleophile? A) HCl B) CH3NH2 C) BF3 D) CH3Br