TGF-α expression in SMG of group A2 and B2 at week 9. Longitudinal section of ductal epithelium of SMG under 10x magnification showing A, Control group (A2) with TGF-α intensity score of highly positive (4+). B, Experimental group (B2) showing highly positive (4+) TGF-α intensity score. C, Control group (A2) showing TGF-α intensity score of positive (3+). D, Experimental group (B2) with TGF-α intensity score of positive (3+).