TFF3 and obstructive sleep apnea syndrome: Since OSA is not only associated with epithelial changes [13,14] but also with an increase in airway resistance as well as mouth, throat and nose dryness, and because TFF peptides, in particular TFF3 and -2, have an immense impact on mucus viscosity and rheology (as mentioned above) as well as protective effects such as proliferation and migration enhancement, anti-apoptosis and wound healing, at least in mucosal surfaces, we were keen to learn more about the possible role of TFF3 and -2 in OSA and rhonchopathy.