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(a) ELISA titration of GAS-specific rabbit antiserum on a GASP-HSA (compound 8)-coated plate. OD 450 nm, optical density at 450 nm. (b) Inhibition of GAS-specific rabbit antiserum with GAS inhibitors on a GASP-HSA (compound 8)-coated plate. The numbers for the symbols indicate compounds shown in Fig. 1.
