Adhesion of transfectants. Adhesion of Mac-1/(CD11b/CD18) (A) and p150,95/(CD11c/CD18) (B) transfectants to iC3b. Adhesion was done in the absence of activating agents, in the presence of 0.5 mM MnCl2, or with the activating monoclonal antibody KIM185 (2.5 μg/mL).