Expression patterns of transcription factors significantly (FDR < 0.05) differentially expressed between iron sufficient and deficient conditions. Transcription factor families on the y-axis refer to the SoyDB transcription factor database  as described in the methods. Absolute fold change in gene expression is plotted on the x-axis. Multiple differentially expressed transcription factors per family are plotted. Additional details on TF expression are provided in Additional file 7: Table S7.