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Anti-A-LPS whole-cell ELISA. Anti-A-LPS dilution 1, corresponding to horizontal axis point 1, represents 1/100 dilution, followed by serial 2-fold dilutions for points 2 to 10. Point 11 represents the controls (secondary anti-mouse IgG horseradish peroxidase conjugate only) which all values were normalized to for each strain. Signal intensity order for strains is indicated on the left, and apparent clustering is indicated by brackets.
