NH2240-31 (A and D), scFv S69-4 H3post (B and E) and Fab S45-18 (C and F) against HS4P (A, B, C) and 2.4/2.4PS4P (D, E, and F). Sensorgrams recorded for protein concentrations of 1 nM, 2.5 nM, 5 nM, 7.5 nM, 10 nM, 20 nM, and 40 nM are shown in A and B. Identical concentrations are displayed with same colors. Proteins were purified by gel filtration immediately prior to the analysis.