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Expression of ICAM-1 binding partners CD11a and CD18 subunits of LFA-1. Placental tissue after normal pregnancies stained for CD11a (A, B) and CD18 (C, D) in red. Nuclei were stained with DAPI (blue). Materal and fetal blood cells (white arrowheads) showed positive staining for both CD11a (A, B) and CD18 (C, D). Placental macrophages (Hofbauer cells) (black arrowheads) expressed only CD11a (C). Representative pictures of 4 control placentas are shown.
