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Morphology of isolated lung CSCs post-PDT. Cells receiving (a) no treatment, (b) irradiation of 10 J cm−2 and (c) PS of 20 µM alone represents healthy viable cells with no cytotoxic morphological changes. (d) Lung CSCs that received PDT using 20 µM AlPcS4Cl and 10 J cm−2 irradiation show indications of apoptotic (green) and necrotic (red) cell death.
