(IMAGE) Kobe University Caption During the night, the cells of transfusion tissue (tt) absorb water and expand (photograph A), but during the daytime the leaves contract (photograph B: taken after sublimation so that cell shapes are visible. p: phloem, x: xylem, bs: vascular bundle sheath, m: mesophyll). Credit 2004- Kobe University. All Rights Reserved. Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.