Fig. 6From: Identification and characterization of a novel stress-responsive outer membrane protein Lip40 from Actinobacillus pleuropneumoniae Humoral responses in mice. Antibodies against rLip40 (a) and ApxI (b) were evaluated at different time points with ELISAs. ELISA titers are expressed as the logarithm (log10) of the reciprocal of the highest dilution of serum with an OD630 value above that of the cutoff value for each mouse. Double asterisks (**) indicate P < 0.01, calculated with Student’s t testBack to article page