Fig. 2
From: Novel meso-substituted porphyrin derivatives and its potential use in photodynamic therapy of cancer
Cellular uptake of the photosensitiser as a function of the concentration. LM3 cells were exposed to different concentrations of the PSs during 3 h or 24 h. Intracellular photosensitiser levels were determined fluorimetrically and normalised per number of cells present at the end of the experiment. Error bars are the standard deviation for three independent experiments