On the cover: Tie2 Expression Pattern in the Kidney. LacZ histochemical staining of a vibratome-sectioned adult kidney from a mouse hemizygous for both Tie2-Cre and Rosa26lacZ (R26lacZ) transgenes showing Tie2 promoter activity consistent with the renal vascular network. Cortical and outer medullary lacZ staining pattern in an adult kidney showing prior or current Tie2-Cre activity in glomeruli, cortical peritubular capillaries, medullary capillary plexus and medullary vascular bundles. Susan Quaggin, Rizaldy Scott, Yael Kenig-Kozlovsky, Northwestern University, Chicago, Illinois.