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Figure S1. Changes in (a) absorption and (b) fluorescence spectra (λex, 430 nm) of Zn-TTHPP (4 μm) with the gradual addition of CT-DNA in phosphate buffer. [CT-DNA], (a) 0 and (f) 34 μm.

Figure S2. Changes in (a) absorption and (b) fluorescence spectra (λex, 430 nm) of Hp (4 μm) with the gradual addition of CT-DNA in phosphate buffer. [CT-DNA], (a) 0 and (k) 66 μm.

Figure S3. Changes in circular dichroism spectra of (a) Zn-TTHPP and (b) Hp (8 μm) with gradual addition of CT-DNA in phosphate buffer. [CT-DNA] (A) (a) 0 and (e) 64 μm; (B) (a) 0 and (f) 128 μm.

Figure S4. Histogram showing the relationship between DNA association constant and the photoinduced DNA damage by the porphyrin derivatives. (Figures S1–S4 showing the absorption, fluorescence and circular dichroism spectra as well as relative plot of DNA association constants vs efficiency of DNA damage induced by TTHPP, Zn-TTHPP and Hp with the gradual addition of CT-DNA.

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