Heatmap of BLASTing Sc substrate_TC families against At families. BLAST homology search of 69 Sc transporters against 84 At transporters from 4 substrate families (amino acids, sugars, phosphates, metals) and 13 TC families (Sc) and 12 TC families (At). The grey scale follows a logarithmic scheme where white means no match better than normalized E < e-04 and black means the best matches better than E < e-20. Families generally match their substrate_TC families. However, they may also match TC families from different substrate_TC families.