There are very few studies regarding fibrosis in IL-4- or IL-13-injected mice but, in contrast to our results, Kaviratne et al. provided evidence that intraperitoneal injections of IL-13 can lead to liver fibrosis by upregulating hepatic Col1, Col3, and Timp1 expression [30]. The gene discussed is TIMP1; the disease is Hepatic fibrosis.