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Pig homogenates measurements with 3 pmol/mg PpIX and pH adjustment between 5.1 to 8.8 (A,B). (A) shows the [PpIX634], and (B) shows [PpIX620]. The physiological range for normal brain and glioma tissue is between pH 6 and 8 (Gerweck and Seetharaman, 1996; Honasoge and Sontheimer, 2013).
