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a) Photodissociation of the alpha chain of Hemoglobin modified with a single NQ. The NQ modification is lost due to homolytic cleavage of the Cβ-S bond of cysteine (labeled as C-S). Backbone fragmentation at cysteine is observed generating d104 and z37. b) Photodissociation of the beta chain of Hemoglobin with two NQ modifications.
