TGF-α expression in SLG of group A2 and B2 at week 9. Longitudinal section of ductal epithelium of SLG under 10x magnification showing A. Control group (A2) showing TGF-α intensity score of minimally positive (1+). B, Experimental group (B2) with TGF-α intensity score of minimally positive (1+). C, Control group (A2) showing an undetectable intensity score (-). D, Experimental group (B2) also showing an undetectable intensity score (-).