[Glu1]-Fibrinopeptide B, a derivative of fibrinopeptide B amino acid residues 1-14, originates from human fibrinopeptide B (hFpB). hFpB is a proteolytic cleavage product of the fibrinogen B beta-chain, specifically generated by thrombin, which plays a significant role in activating neutrophils (PMN), monocytes, and fibroblasts.