Sequence Cluster id id2 desc organism isHeteromeric 1 Singleton1 TCDB::S6EX81 2.A.3.3.23 Branched chain amino acid (Leucine/isoleucine/valine) uptake transporter of 469 aas and 12 TMSs, BcaP or CitA Lactococcus lactis subsp. lactis A12