Crystal structure of a Fab variant containing a fluorescent noncanonical amino acid with blocked excited state proton transfer and in complex with its antigen, CD40L

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Sequence of
     ​G​​D​​Q​​N​​P​​Q​​I​​A​​A​​H​126  ​V​​I​​S​​E​​A​​S​​S​​K​​T​​T​136  ​S​​V​​L​​Q​​W​​A​​E​​K​​G​​Y​146  ​Y​​T​​M​​S​​N​​N​​L​​V​​T​​L​156  ​E​​N​​G​​K​​Q​​L​​T​​V​​K​​R​166  ​Q​​G​​L​​Y​​Y​​I​​Y​​A​​Q​​V​176  ​T​​F​​C​​S​​N​​R​​E​​A​​S​​S​     ​Q​​A​​P​​F​​I​​A​​S​​L​​C​​L​196  ​K​​S​​P​​G​​R​​F​​E​​R​​I​​L​206  ​L​​R​​A​​A​​N​​T​​H​​S​​S​​A​216  ​K​​P​​C​​G​​Q​​Q​​S​​I​​H​​L​226  ​G​​G​​V​​F​​E​​L​​Q​​P​​G​​A​236  ​S​​V​​F​​V​​N​​V​​T​​D​​P​​S​246  ​Q​​V​​S​​H​​G​​T​​G​​F​​T​​S​256  ​F​​G​​L​​L​​K​​L​

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