Proteobacteria
alpha
Rhodobacter group
Paracoccus denitrificans A
Paracoccus denitrificans B
Rhodobacter capsulatus
Rhodobacter capsulatus ATCC 23782
Rhodobacter capsulatus NCIB 8254
Rhodobacter sphaeroides 241A
Rhodobacter sphaeroides 241B
Rhodobacter sphaeroides A
Rhodobacter sphaeroides B
Rhodobacter sphaeroides denitrificans