C Fries A, Lawson SD, Wang LC, Slaughter KV, Vemula PK, Dhayani A, Joshi N, Karp JM, Rickard RF, Gorantla VS, et al. Graft-implanted, enzyme responsive, tacrolimus-eluting hydrogel enables long-term survival of orthotopic porcine limb vascularized composite allografts: A proof of concept study. PLoS One. 2019;14(1):e0210914.