IL13 and asthma: Future studies in the sheep asthma model may investigate the changes in expression and subsequent therapeutic targeting of other Th2-associated mediators such as IL-17, IL-22, IL-25 and IL-33 [60–63], or miRNAs thought to play a role in directing the pathways of IL-4 and/or IL-13 production in allergic airways, including miR-21, miR-145 and miR-155 [64–67].