In monocytes and macrophages Interleukin-13 (IL13) enhances the expression of many members of the integrin family including Integrin alpha M (ITGAM, CD11b), Integrin alpha-X (ITGAX, CD11c), Integrin beta 2 (ITGB2, CD18) and Integrin beta 1 (ITGB1, CD29) (Zurawski & de Vries 1994), MHC class II and ow affinity immunoglobulin epsilon Fc receptor (FCER2, CD23) expression (de Vries 1998). In endothelial cells IL13 induces expression of Vascular cell adhesion protein 1 (VCAM1), which is important in the recruitment of eosinophils (Bochner et al. 1995).