Conservation in and around crucial residues (FeMo-co and P-cluster ligands) in NifD and NifD-like protein sequences from P. sabinae The P-cluster and FeMo-co ligands, based on A vinelandii numbering, are indicated with vertical arrows. Ab = A. brasilense, Av = A. vinelandii, Ct TLS = C. tepidum TLS, Cb = Clostridium beijerinckii, Cc 743B = C. cellulovorans 743B, C UCYN-A = Cyanobacterium UCYN-A, C 51142 = C. sp. ATCC 51142, C 8802 = C. sp. PCC 8802, Fal = F. alni ACN14a, Fsp = Frankia sp., F CcI3 = F. sp. CcI3, F EAN1pec = F. sp. EAN1pec, F EuIK1 = F. sp. EuIK1, Hc = H.chlorum, Kp = K. pneumoniae 342, Mm = M. maripaludis, Mm S2 = M. maripaludis S2, Na 0708 = N. azollae 0708, N 7120 = N. sp. PCC 7120, Pf = P. fujiensis, Pt = P. terrae HPL-003, Ssp = S. sp., S JA-3-3Ab = S. sp. JA-3-3Ab, Te = T. erythraeum IMS101.