Fig. 3From: Challenges and advances in materials and fabrication technologies of small-diameter vascular graftsIllustration of the mechanism of (A) passive type modification (carboxy betaine-REDV polymer coating). Reproduced with permission [54]. Copyright 2012, John Wiley and Sons. (B) active type modification (thrombin-responsive clot-lysing activity). Reproduced with permission [55]. Copyright 2014, Royal Society of ChemistryBack to article page