Local distribution of vanadium in the living blood cells of ascidians by fluorescence scanning X-ray microscopy ID21 at ESRF K. Takemoto, T. Ueki, B. Fayard, A. Yamamoto, M. Salomé, S. Scippa, J. Susini, T. Uyama, H. Michibata and H. Kihara J. Phys. IV France, 104 (2003) 333-336 DOI: 10.1051/jp4:200300093