Anti-CD11a In Vivo Antibody - Low Endotoxin (38) recognizes Human CD11a. Anti-Human CD11a (Anti-LFA-1a) recognizes the (Mr 175 kDa) a chain of the leukocyte function associated antigen-1 (LFA-1). The leukocyte integrin LFA-1 is a member of a family of heterodimeric receptors that mediate divalent cation-dependent cellular adhesion reactions. LFA-1A binds to domain 1 of an intercellular adhesion molecule (ICAM) on target tissues.