Fig. 4From: Soybean (Glycine max) SWEET gene family: insights through comparative genomics, transcriptome profiling and whole genome re-sequence analysisConserved domain architecture of SWEET proteins. SWEET proteins classified into 3 major types based on number of 3-TM domains (Additional file 4). Proteins with single 3-TM domain classified as semiSWEET [50]; proteins with two 3-TM (7 α-helical) classified as SWEET genes [43]; and proteins with four 3-TMs were named as extraSWEET genes. Black box shows the associated protein domains, position of associated protein domains could be -N or -C terminal (Additional file 4). Not drawn to scaleBack to article page