Genes on the chromosome and six plasmids of Rlv3841 encoding components of ABC transporter systems. The nucleotide composition (GC3s, i.e. G+C content of silent third positions of codons) of the components is shown. Members of the most abundant families are indicated, defined according to Saier . ABC, ATP-binding cassette; Rlv3841, R. leguminosarum biovar viciae strain 3841.