mcd99Characterization of the interaction between mCD99 and mCD99L2. (A) Diagram of the DNA constructs for the expression of mCD99 or mCD99L2 proteins tagged with Myc, Flag, or HAIn the case of mCD99, two adjacent O- glycosylation sites, Thr-45 and Thr-50 (NMKPT 45 PKAPT 50 PKKPS) are relevant for PILR ␣ recognition (13). Sequence alnment of human