Fig. 41
[Taken from reference (Rong et al. 2014)]
a Viability of 4T1 cells incubated with various concentrations of free HPPH, GO–PEG, and GO–PEG–HPPH after irradiation at 671 nm (4 mW/cm2, 3 min). b Tumor growth curves of different groups of tumor-bearing mice after PDT treatment. The tumor volumes were normalized to their initial values