Factor XIII itself might play a role in the hypothetical changes to the collagen of the plateaued penis via its cross-linking abilities.
How do you suggest the cross-linking happens in the factor XIII direction?
I can’t find something I can understant about this factor and it’s activation. “It is activated by thrombin to factor XIIIa. XIIIa is an enzyme of the blood coagulation system that crosslinks fibrin. Deficiency of XIII worsens clot stability and increases bleeding tendency.” this is the only google def I understand a bit.