Task: Named Entity Recognition
Input (English):  MATERIALS AND METHODS : The cells were stimulated by 100 ng / mL TPO and / or 100 ng / mL TGF - beta1 and analyzed for proliferation ( 3H thymidine incorporation ) , viability ( trypan blue exclusion ) , and protein expression and phosphorylation ( Western blot ) .
Output (English): TGF - beta1