Homologs of melB from Escherichia coli BW25113
melB: melibiose:sodium symporter (NCBI)
SEED: Melibiose carrier protein, Na+/melibiose symporter
KEGG: melibiose permease
Top 100 hits from BLASTp (E < 0.01)
Or try PaperBLAST, fast.genomics, the ENIGMA genome browser, or the comparative fitness browser