Fig. 2

Macroscopic and microscopic views of the samples (control group: a, c, e, g, i; TA group: b, d, f, h, j). a, b Macroscopic views of samples at fourth week. c, d Microscopic views of samples at fourth week. e, f Macroscopic views of samples at eighth week. g, h Microscopic views of samples at eighth week. i, j Microscopic view of samples stained with safranin-o at eighth week