CD40LG and infection: A panel of three mAb [anti-IgM (B lymphocyte), anti-CD3 (T lymphocyte), or anti-CD172a (macrophage)] were used to surface label the cells, and intracellular staining with a second mAb specific for equine merozoite antigen 1 and 2 (anti-EMA 1/2) was used to detect infection.