<p> Interleukins (IL) are a group of cytokines that play an important role in the immune system. They modulate inflammation and immunity by regulating growth, mobility and differentiation of lymphoid and other cells. </p> <p> Interleukin-20 (IL-20) belongs to the family of IL-10-related cytokines, which includes IL-10, -19, -20, -22, -24 and -26 [<cite idref="PUB00046044"/>]. IL-20 induces STAT activation through two types of receptor complex, one of which it shares with IL-19, indicating that their biological activities may overlap [<cite idref="PUB00027532"/>]. Both cytokines may play an important role in regulating the development and proper functioning of skin [<cite idref="PUB00027532"/>]. IL-20 has also been shown to promote endothelial cell tube formation, suggesting that it may be involved in vascular vessel maturation and remodelling [<cite idref="PUB00046072"/>]. </p> Interleukin-20