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FACS cellular uptake assay of d- and retro-isomers of Tat49–57: d-Tat49–57 (Fl-ahx-rkkrrqrrr), Tat57–49 (Fl-ahx-RRRQRRKKR), and d-Tat57–49 (Fl-ahx-rrrqrrkkr). Jurkat cells were incubated with varying concentrations (12.5 μM shown) of peptides for 15 min at 23°C.
