These defenses are mediated via formation of a physical barrier constituting the tight junction proteins and a chemical barrier that consists of antimicrobial and inflammatory proteins.
Varnarlínan samanstendur af þéttitengja próteinum sem mynda saum milli þekjufrumna og seyttum efnum t.d. örveruhamlandi og bólgumiðlandi peptíðum/próteinum.