Fig. 2From: Genome-wide identification and expression analysis of SWEET gene family in Litchi chinensis reveal the involvement of LcSWEET2a/3b in early seed developmentNeighbor-joining phylogenetic tree of SWEET proteins from litchi and other plant species. The roman numbers (I-IV) labeled with various colors indicate different clades. LcSWEETs are indicated by yellow star. The amino acid sequences and their accession numbers used to generate this phylogenetic tree are listed in Additional file 3: Table S1Back to article page