Fig. 7

H&E staining of the rat mandibles after 4 weeks (a–f) and 8 weeks (g–l) post surgery. a, g Control. b, h HPDA NPs. c, i Aspirin@HPDA NPs. d, j Ascorbic acid@HPDA NPs. e, k Tacrolimus@HPDA NPs. f, l Simvastatin@HPDA NPs. Scale bar is 1 mm