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Generation of cR10 containing cell-permeable fluorescent probes and ESI–MS characterization of HA-Cys(cR10)-Ub-MAL-TER (5). (a) Scheme illustrating the generation of HA-Cys(cR10)-Ub-MAL-TER (5). (b) ESI–MS characterization of cell-permeable fluorescent probe HA-Cys(cR10)-Ub-MAL-TER (5). (c) Structure of cell-permeable fluorescent probes HA-Cys(cR10)-Ub-NRL-TER (6), TAT-HA-Ub-MAL-TER (7), TAT-HA-Ub-NRL-TER (8), and HA-Ub-MAL-TER (9).
