Graft-implanted, enzyme responsive, tacrolimus-eluting hydrogel enables long-term survival of orthotopic porcine limb vascularized composite allografts: A proof of concept study. oleh C Anton Fries, Shari D Lawson, Lin C Wang, Kai V Slaughter, Praveen K Vemula, Ashish Dhayani, Nitin Joshi, Jeffrey M Karp, Rory F Rickard, Vijay S Gorantla, Michael R Davis