A, Binding of HLA-DR antibody to antigen-presenting cells and Int1-negative blastospores (MT) in the absence of biotinylated (biot) Pep263. B, Binding of HLA-DR antibody to antigen-presenting cells and MT in the presence of biot Pep263. C, Binding of Pep263 to antigen-presenting cells. Mann-BSA, mannosylated bovine serum albumin; PBMC, peripheral blood mononuclear cell.