Fig. 3. (A) In vitro release of heparin and IL-4. IL-4 and heparin release were detected in TNT/IL-4/G delivery systems at 12 h, 1 d, 2 d, 3 d, 5 d, 7 d and 11 d. (B) Cytotoxicity was detected in each group. Results are presented as mean, *P < 0.05, **P < 0.01.