5-AR glycates histones in vitro. (A) Schematic depicting incubation of histones with probes followed by click labeling with DBCO Cy5. (B) Incubation of recombinant histones with PBS, 5 mM of d-ribose, 1-AR, or 5-AR for 8 h followed by click-labeling and in-blot fluorescence analysis. (C) Histones glycated with 5 mM of 5-AR, labeled with DBCO Cy5, analyzed side-by-side by in-blot fluorescence and Coomassie Brilliant Blue (CBB) for loading control.