I suggest to use differentiating agents such as Retinoic Acid or BDNF in serum-free medium. I suggest to read the following attached file wich contains two papers on Sh5y differentiation (http://www.ncbi.nlm.nih.gov/pubmed/10936180 and http://www.ncbi.nlm.nih.gov/pubmed/20497720)
U can use RA as reported before...or switch to PC12 cells and differentiate them with NGF 50 ng/ml...very nice cells, cholinergic neuron like morphology and features..
Thanks all.. But my intention was, what if I use only low serum concentration with out RA. How would it differ rather in combination of both ? Isn't it possible ?