For the BrdU incorporation assay, the BrdU Cell Proliferation Assay (QIA58, Calbiochem, Darmstadt, Germany) was used according to the manufacturers instructions. 3000 cells/well were plated on poly-L-ornithine/laminin-coated 96well plates and BrdU was added for 24 h.
To monitor proliferation, neural precursor cells were cultured as neurospheres plating 500 000 cells per 10 cm dish/passage. The resulting cell number was determined for each passage and the proliferation factor was calculated.
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