Original gel images of two-dimensional electropherograms from cultured neurospheres. (A) Two dimensional gel image of subventricular zone, (B) olfactory bulb neurospheres. The gel images show a similar spot distribution pattern, but distinct heterogeneities in the protein expression profile are obvious. (C) Overlaid gel images, false-color coded, to visualize protein expression differences. Green spots correspond to subventricular zone, red spots to olfactory bulb proteins, yellow spots result from merged spots.