Comparing the phenotype of DCs previously cryopreserved in infusible cryomedia or human AB serum containing 10% DMSO. (A) Middle panel, DCs that had been cyropreserved with infusible cryomedia showed similar expressions of CD86 and CD1c as fresh DCs (first panel) and higher CD80, CD40 and MHC Class I levels after being thawed and replated for 24 h in fresh human AB serum-supplemented CellGenix DC media. Third panel, DCs that were cryopreserved with 90% human AB serum plus 10% DMSO exhibited similar level of CD80, CD40, MHC Class I and CD1c as fresh DCs. DCs cryopreserved in infusible cryomedia expressed approximately 50% lower levels of HLA-DR (**P = 0.001) compared to fresh DCs. On the other hand, DCs cryopreserved in human AB serum plus 10% DMSO media expressed approximately 80% lower levels of HLA-DR (**P = 0.004) compared to fresh DCs. Data were from a clinical-scale Nunclon™Δ Surface 1-tray Cell Factory and was representative of 3 independent research-scales experiments (i.e. DCs from 3 different individuals) in Nunclon™Δ Surface T25 cm2 flasks. (B) Summary of flow cytometry results from the mean of 3 independent research-scales experiments in Nunclon™Δ Surface T25 cm2 flasks (MFI ± SEM). P values are determined with unpaired Student's t test. ** denotes P value highly significant.