The 96-well plate configuration of MTT assay. Plate configuration: Blue, Row B from B2 to B7 was control groups, which were incubated with 0.9% NaCl. Red panel indicated positive control of Photofrin®: Row C, from C2 to C4, concentration = 100 μg/mL; Row D, from D2 to D4, concentration = 10 μg/mL; Row E, from E2 to E4, concentration = 1 μg/mL; Row F, from F2 to F4, concentration = 0.1 μg/mL; Row G, from G2 to G4, concentration = 0.01 μg/mL; Green panel indicated sinoporphyrin sodium (DVDMS): Row C, from C5 to C7, concentration = 10 μg/mL; Row D, from D5 to D7, concentration = 1 μg/mL; Row E, from E5 to E7, concentration = 0.1 μg/mL; Row F, from F5 to F7, concentration = 0.01 μg/mL; Row G, from G5 to G7, concentration = 0.001 μg/mL.