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Distribution of hematoporphyrin monomethyl ether (HMME) in tumors measured by fluorescence spectrometry. Tumors were analyzed as described for Figure 5. (a–c) HMME distribution at 2 h after application of a hydrogel to the skin (a) and at 6 h (b) and 24 h (c) after intravenous administration in phosphate-buffered saline.
