CCL21 and infection: In one study, DCs transduced with adenoviral CCL21 (AdCCL21) at multiplicities of infection (MOIs) of 50:1 or 100:1 were able to produce up to 210 ± 9 ng/mL and 278 ± 6.5 ng/mL human CCL21 per 106 cells per 48 h in vitro, respectively [49].