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benzoic acid works when the formula is acidic

J Biol Chem (2009) 284(1):15

[0347] In certain embodiments the CDR1, 2, and/or 3 regions of the engineered antibodies described above can comprise the exact amino acid sequence(s) as those disclosed herein (e.g., CDRs of M25ADLF, M25ADLFEG, M25ADLFDS, M25FYIA, M25FYIAEG, M25FYIADS, M25, M25EG, M25DS, M25AELF, M25AELFEG, M25AELFDS, M25ADL99P, M25ADL99G, M25ADS95R, M25ADD28G, M25ADS91G, M25ADY93H, M25ADYHSRLF, M25GRITSGFYGDwtLC, M25FSITSGFYGDwtLC, M253018IA, M253018LF, M25AD, M25ADX, ALPPL2rd3_l, ALPPL2rd3_2, M25AGIA, M25AGLF, M25ASIA, M25ASLF, M25ASwt, M25AVIA, M25AVLF, M25ALIA, M25ALLF, M25wtIA, and/or M25wtLF)

This same GSTP1, on the other hand, can be a tumor suppressor in the Apc Min/+ mouse model, in which the deletion of GSTP1 results in increased colon cancer incidence and tumor multiplicity (9)