I'm trying to test expression of a gene in sorted cells. I plan to extract RNA from sorted cells and to do RT-PCR (reverse transcription PCR). The problem is that from sorting, I can only collect 100-150 cells at most. I have asked RNA extraction kit from Qiagen and Invitrogen, both kits provided can extract RNA from small number of cells in theory but with low success rate. I want to know if anyone else did similar assays and if there are better choices?