Human ICOS, Fc fusion protein, also known as inducible T-cell costimulator and CD antigen 278, activation-inducible lymphocyte immunomediatory molecule, AILIM, CD278, and CVID1. GenBank Accession No. NM_012092, a.a. 21-140 expressed in a HEK293 cell expression system. MW = 40.2 kDa. This protein runs at a higher MW by SDS-PAGE due to glycosylation.