Coloured scanning electron micrograph (SEM) of neural stem cells from a neurosphere (courtesy of Sam Jackson). A neurosphere is a culture system composed of free-floating clusters of neural stem cells. Since neural stem cells cannot be studied in vivo ( within the body), neurospheres provide a method to investigate neural precursor cells in vitro (outside the body). Neural stem cells that are transplanted are able to cross the bloodâbrain barrier and integrate themselves into the host's brain without disrupting normal function. This therapeutic application of neural stem cells derived from neurospheres is still in its infancy with respect to efficacy, but it has a high potential for success in treating many diseases. Magnification: x2000 when printed at 10 centimetres wide.
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