Image: In-depth fluorescence imaging of renal blood vessels in a mouse kidney, achieved by kidney perfusion with lectin-dye conjugates before optically clearing the tissue for deep-tissue microscopy. The rainbow colours represent the blood vessels and glomeruli at different focal depths. Cover image supplied by Chih-Yung (Daniel) Lin in the SunJin Lab and Shiue-Cheng (Tony) Tang at the Department of Medical Science, National Tsing Hua University, Taiwan.