This month's winning image was submitted by Yu-Tzu Tai (University of Cambridge (ytt21@cam.ac.uk)). It shows neural progenitor cells expressing tyrosine hydroxylase.

Green fluorescence represents β-tubulin staining; red fluorescence represents tyrosine hydroxylase staining; and blue fluorescence represents glial fibrillary acidic protein staining. The image was acquired using an optical microscope (DMRD, Leitz). Bar, 40 μm.

We are pleased to acknowledge the help of our two external advisors, Ariel Ruiz i Altaba (Developmental Genetics Program, New York Medical Center) and Lelio Orci (Department of Morphology, University Medical Center, Geneva).