CD226 and systemic lupus erythematosus: Other integrins, CD49 and CD49B (platelet membrane glycoprotein Ia), integrin β6, fibrinogen receptor β subunit (VLA-4), as well as P-selectin (CD62P), CD36 (platelet glycoprotein IIIb), CD31 (PECAM-1, platelets, leukocytes, endothelial cells), and CD226 (NK cells, platelets, monocytes, T-cell subsets), were all strongly decreased in SLE-MPs (q < 0.0001).