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(A) Structures of NAAs 10-18. (B) Site-specific incorporation of 10-18 into sfGFP at its S2 position. C indicates a control experiment without the addition of any NAA. ND stands for non-detected. (C) Deconvoluted ESI-MS spectra of sfGFP variants incorporated with 10-18. In sfGFP-X, X is one of 10-18 incorporated at the S2 position.
