TGFB1 and allergic rhinitis: Evidence has also been provided for a correlation between TGF-β and higher intraepithelial mast cell numbers with co-localised TGF-beta receptors, suggesting that the expression of TGF-β may represent an important biological process involved in either the recruitment or retention of mast cells within the epithelium in naturally occurring allergic rhinitis [33], [34], [35].