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Confocal fluorescence (left) and DIC (right) microscopy of HeLa cells treated for 1 h with PB-Gly-Taxol (A, B) and PB-GABA-Taxol (C, D) without (A, C) and with (B, D) the efflux inhibitors verapamil (B) and probenecid (D). Scale bar: 20 μm.
