Bacteroid development protein, BacA; probably a peptide/bleomycin uptake transporter (Ardissone et al., 2011; Marlow et al., 2009). The bacterial BacA protein is essential for bacteroid differentiation in legumes producing nodule-specific cysteine-rich peptides (NCRs), which induce the terminal differentiation of the bacteria into bacteroids (Haag et al. 2013). This protein and others in this family are homologous to the membrane constituents of 3.A.1.203 family in the ABC superfamily in TCDB.