Fig. 6From: Transcriptome-based gene regulatory network analyses of differential cold tolerance of two tobacco cultivarsGenetic regulatory networks (GRNs) between hub genes. The circle represents gene, the diamond represents TF, and the connecting line is divided into source and arrow. The gene pointed by the arrow represents the gene targeted by source transcription factor. If both ends of the connecting line are arrows, the two TFs regulate each otherBack to article page