Background：CD18 is a 95 kD protein, also known as integrin b2 subunit. It is expressed on all leukocytes. CD18, in association with integrin a chain CD11a, CD11b, and CD11c forms LFA-1, Mac-1, and aXb2, respectively, and plays an important role in leukocytes adhesion. The CD18 integrin complexes bind ICAM-1 （CD54）, ICAM-2 （CD102）, ICAM-3 （CD50）, iC3b, and fibrinogen.
Buffer：0.2 um filtered in PBS, pH7.2. Azide Free （AF）/Low Endotoxin （LE）： Contains no stabilizers or preservatives. Endotoxin level is ＜ 2 EU/mg （ ＜ 0.002EU/ug） as Determined by LAL gel clotting assay.
