CEACAM1 and infection: During the course of the H. pylori infection experiment, we noticed that the level of ectopically expressed human CEACAM1 or CEACAM5 was substantially diminished after 7 h of infection with wild-type H. pylori (Figure 4A, indicated by comparison of lane 1 and lane 2 for human CEACAM1 and by comparison of lane 3 and lane 4 for human CEACAM5).