LAMP1 levels in infected T84 cultures grown on a solid substrate (A) or polarized on semipermeable membranes (B). (A) Lanes 1 and 2, uninfected cultures; lanes 3 and 4, cultures infected with iga MS11A500; lanes 5 and 6, cultures infected with WT MS11A. (B) Lanes 1 and 2, uninfected monolayers; lanes 3 and 4, monolayers infected with WT MS11A.