Figure 2. Lymphoproliferative responses induced by OMP26 protein by rat lymphocytes obtained after immunization with OMP26 peptides. Lymphocytes from immune and non-immune rats were stimulated with whole OMP26 protein (10 μg/ml). Background lymphoproliferative responses to the negative E. coli control have been subtracted. Only lymphocytes from animals immunized with the T3+T4 peptide demonstrated a significant response to OMP26 protein stimulation compared with non-immunized rats (**p < 0.02). The OMP26 control showed a significant response (***p < 0.001). Values presented are expressed as mean counts per minute (CPM) ± standard deviation. NI = non immune.