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Release studies of photosensitizers (PS) hydrogel in vitro. (a) 5-aminolevulinic acid (ALA); (b) Hematoporphyrin monomethyl ether (HMME). The upper row refers to the release of PS hydrogel in PBS, and the lower row indicates the release of PS hydrogel in RPMI1640 medium with SW837 cells cultured. The inserts show the appearance of the formed PS hydrogel.
