This image shows human neurons derived from embryonic stem cells (H9), at 21 days after differentiation. Nuclei are stained with DAPI and the neuronal microtubules are stained with an antibody against β-III-Tubulin. These cells were used to test candidate modifiers of α-Synuclein levels. For more information, see the article by Rousseaux et al. (pages 9286–9301)