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Immunohistochemical staining for leukocyte common antigen (CD45) in the lungs from C3H mice treated with (A) sham irradiation, (B) x-irradiation, or (C) x-irradiation followed by ICAM-1 blocking antibody. Five weeks after treatment, lungs were fixed, sectioned, and stained with anti-CD45 antibody using HRP conjugates. Large arrows indicate CD45 on inflammatory cells, and small arrows indicate erythrocytes which demonstrate autofluorescence.
