1. Univ. Bordeaux, CNRS, CENBG, UMR 5797, 33170 Gradignan, France
2. X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Lemont, IL 60439, USA
3. Univ. Bordeaux, CNRS, Interdisciplinary Institute for Neuroscience, IINS, UMR 5297, 33000 Bordeaux, France
4. Univ. Bordeaux, CNRS, INSERM, Bordeaux Imaging Center, BIC, 33000 Bordeaux, France