Courtesy of Eric D. Laywell SPHERES OF PROMISE These neurospheres, clusters of cells in culture derived from the CNS of mice, are stained with antibodies against a neuronal protein (red), and a astrocyte protein (green). They have a nuclear counterstain (blue). The brain and spinal cord were once considered mitotic dead ends, a division of neurons dwindling with toddlerhood, with memory and learning the consequence of synaptic plasticity, not new neurons. But the discovery of neural stem

Researchers aim to unravel the molecular mechanisms by which a single genotype gives rise to diverse castes in eusocial organisms.