Fibrinogen-related domains (FReDs); C terminal globular domain of fibrinogen. Fibrinogen is involved in blood clotting, being activated by thrombin to assemble into fibrin clots. The N-termini of 2 times 3 chains come together to form a globular arrangement called the disulfide knot. The C termini of fibrinogen chains end in globular domains, which are not completely equivalent. C terminal globular domains of the gamma chains (C-gamma) dimerize and bind to the GPR motif of the N-terminal domain of the alpha chain, while the GHR motif of N-terminal domain of the beta chain binds to the C terminal globular domains of another beta chain (C-beta), which leads to lattice formation.