mcd99In contrast, the anti-mCD99 antibody recognizes the mCD99-Fc used to immunize the rabbits (arrowhead, running at the expected M r of ∼ 75 kD). Display full size. Fure 4When coexpressed, mCD99 formed heterodimers with mCD99L2, as well as homodimers, and the heterodimers were localized more efficiently at the plasma membrane