MOESM1 of Selection and validation of reference genes for quantitative expression analysis of miRNAs and mRNAs in Poplar TangFang ChuLiwei ShuWenbo HeXuejiao WangLijuan LuMengzhu 2019 Additional file 1: Fig. S1. The melting curves of candidate reference genes. Fig. S2. The PCR amplification specificities of candidate reference genes detected by agarose gel electrophoresis.