Brain cancer glial cells. Fluorescence deconvolution micrograph of cultured microglial cells from a glioblastoma (tumour) in the brain. Cell nuclei are blue and f-actin (protein) is green. Glioblastomas are the most common and most aggressive form of brain tumour. They are derived from glial cells in the central nervous system (CNS). Magnifi cation x300 when printed 10 cm wide.

R. Bick, B. Poindexter, UT Medical School/Science Photo Library