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Western blot analysis of placental hybridoma cells (clone AC1M88) with mAb 4D1/C2 for CEACAM1 expression. A–C: Placental hybridoma cells (clone AC1M88). A: Untransfected. B: CEACAM1-transfected, staining for CEACAM1. C: Mock-transfected. D: Positive control (G361 cells).