Before revision:  At high stress, the protofibrils contribute independently to the network elasticity, which may reflect a decoupling of the tight bundle structure.
After revision:  We demonstrate that the tightness of coupling between protofibrils in the fibers can be tuned by the degree of enzymatic intermolecular crosslinking by the coagulation Factor XIII. Furthermore, at high stress, the protofibrils contribute independently to the network elasticity, which may reflect a decoupling of the tight bundle structure.