A cell adhesion molecule that, in humans, is encoded by a gene on the PSEUDOAUTOSOMAL REGION of SEX CHROMOSOMES. It functions in CELL ADHESION of T-LYMPHOCYTES and ROSETTE FORMATION by ERYTHROCYTES. It is also involved in the migration of LEUKOCYTES through the ENDOTHELIUM BASEMENT MEMBRANE. The 12E7 antigen co-localizes with, but functions independently of PECAM-1.

Synonyms: Antigens, CD99, MIC2 Protein, Antigen, 12E7, CD99 Molecule, 12E7 Protein, 12E7 Antigen, 0, T Cell Surface Glycoprotein E2, Antigen, E2, T-Cell Surface Glycoprotein E2, CD99 Antigens, CD99 Antigen, E2 Antigen, Antigen, CD99