Peptide released from the amino end of fibrinogen by the action of thrombin to form fibrin during clotting of the blood

Usage examples of fibrinopeptide.

For instance, genes coding the proteins known as fibrinopeptides change in evolution at a rate that closely approximates the basic mutation rate.

All the five molecules agree in placing human, chimp and monkey close to each other, but there are some disagreements over which animal is the next closest to this cluster: haemoglobin B says the dog is, fibrinopeptide B says the rat is.

One of them has to be more recent than the other, so either haemoglobin B or fibrinopeptide B must be wrong in its estimate of evolutionary relationships.

If we are truly closer to the dog, then this means that we and the rat have converged on one another with respect to our fibrinopeptide B.

Haemoglobin genes have a rate of changing that is intermediate betwen histones and fibrinopeptides.