Fig. 2

a TEM analysis of CD31. The insert is the size distribution of CD31. b SEM image of CD-Plys hydrogel. Scale bar: 200 nm. c Photographs of the Plys solution (400 mg/mL), the CD31 solution (200 mg/mL), and CD-Plys hydrogel (Plys = 400 mg/mL, CD31 = 200 mg/mL) at room temperature. d The injectability of CD-Plys hydrogel under d natural light and e UV (365 nm) light. f Self-healing performance of CD-Plys hydrogel. g Frequency sweep measurement for CD-Plys hydrogel. h Strain sweep measurement for CD-Plys hydrogel at fixed angular frequency of 1 Hz. i Hemolytic activity of CD-Plys hydrogel