I am doing 1 step qRT-PCR using quantifast SYBR RT-PCR and using the recommended protocol by Qiagen. I get pretty narrow peak for positive control (HepG2) but not really for THP-1 induced macrophage, which is 70-95 °C. Since the background of NTC is clear and no primer dimer. May I excluded is the reagent & primers problem? I know the expression of my target gene is low in macrophage, will this be a reason?