IL4 and infection: In response to infection (LCL-Vacc), all cytokines, with exception of IFN-γ, were detected in all clones and, similarly to the response to low antigen concentration (peptide at 5 ng/ml), GM-CSF, TNF-α, IL-13 and IL4 were detected at 48 hours at significantly higher levels than those at 6 hours.