FIG. 1.

Inhibition of the proliferation of C. parvum-sensitized PBMC induced by two IEC fractions (IEC1 and IEC2) and the recombinant peptide SA35 with a MAb directed against MHC class II-specific HLA-DR. PBMC were harvested on day 7 of culture; 0.5 μCi of [³H]thymidine were added during the last 18 h of culture. The SI was calculated as counts per minute in the presence of antigen divided by counts per minute in the absence of antigen. White bars, IL-2; black bars, SA35 peptide; striped bars, SA40 peptide; dark gray bars, IEC1; light gray bars, IEC2.