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In vitro photodynamic efficacy of MMP2P and MMP2P-GNR. (a) HT1080 (MMP2-positive) and (b) BT20 (MMP2-negative) cells were treated with either 5 μM PPa equivalent MMP2P or MMP2P-GNR for 15 h in the dark prior to light illumination with 670-nm diode laser. Cell viability was determined by MTT assay. Data represent mean ± S.D. (n = 4).
