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Competition for 1163-SU5 peptide binding. Serum A (black column) and serum B (shaded column) were allowed to react with 1163-SU5-total peptides in an ELISA without (no) or with the following competing peptides: 1163-SU5-total, 1163-SU5-variable, 615-SU5-total, 615-SU5-variable, Zn-SU5-total, and Zn-SU5-variable (Table 1). OD at 405 nm was measured at 30 min after addition of the chromophore. The cutoff (dotted line) was set at an OD of 0.3.
