A–OITC binding curves of (A) CEACAM1F29A, (B) CEACAM1Q44A, (C) CEACAM1Q89A, (D) CEACAM1L95AA, (E) CEACAM1V96A, and (F) CEACAM1N97A titrated into HopQWT. ITC binding curves of (G) HopQI102A. (H) HopQN137A, (I) HopQT149A, (J) HopQL150A, (K) HopQM240A, (L) HopQI242A, (M) HopQT370A, (N) HopQΔ135–136Δ141–142, and (O) HopQβ2‐α4:BabA being titrated with CEACAM1WT.