Several errors occurred in the article by G. Badr, H. Waly, H.M. Saad Eldien, H. Abdel-Tawab, K. Hassan, I.M. Alhazza, H. Ebaid, and S.H. Alwasel, entitled „Blocking Type I Interferon (IFN) Signaling Impairs Antigen Responsiveness of Circulating Lymphocytes and Alters Their Homing to Lymphoid Organs: Protective Role of Type I IFN“ [Cell Physiol Biochem 2010;26:1029-1040 (DOI:10.1159/000323978)]. There is a mistype error in the name of antibody „CD220“. It should read „B220“: - Page 1029: Abstract, Line 12: „Results: Flow cytometry analysis to monitor the blood lymphocyte phenotype and proliferation have shown a significant decrease in CD45R/CD220+ B cells, CD4+ and CD8+ T cells in treated animals“ is incorrect. It should read: „Results: Flow cytometry analysis to monitor the blood lymphocyte phenotype and proliferation have shown a significant decrease in CD45R/B220+ B cells, CD4+ and CD8+ T cells in treated animals“. - Page 1031: CFSE-Labeled Cell Proliferation Assay: Line 16: „On day 6, cells were washed in PBS and were stained with surface antigens anti-CD3-PE, CD45A/CD220-PE [RA3-6B2 and rat IgG2a,κ] or isotype control (BD biosciences)“ is incorrect. It should read: „On day 6, cells were washed in PBS and were stained with surface antigens anti-CD3-PE, CD45A/B220-PE [RA3-6B2 and rat IgG2a,κ] or isotype control (BD biosciences)“. - In Figure 1, panel A: „CD45R/CD220-FITC“ is incorrect. It should read: „CD45R/B220-FITC“. The authors regret any inconvenience caused.