Induction of capping. Confocal microscopy of trophozoites before (panels 1, 3, and 5) and after (panels 2, 4, and 6) induction of capping for 30 min using antibodies against the heavy subunit of the Gal-lectin. Each panel shows the fluorescent Gal-lectin on the left side and the fluorescent Gal-lectin superimposed on a Nomarsky section on the right side. 1 and 2, Nontransfected strain HM1:IMSS; 3 and 4, transfectant pCONTROL; and 5 and 6, transfectant pN-TRUNC.