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the SR gene cluster encompasses five ORFs with a total length of 7389 bp. The sreA gene encodes the 110000 Da subunit of SR. sreB encodes an FeS protein, sreC encodes a hydrophobic protein with 10 predicted transmembrane helices. The sreD gene encodes a putative hydrophilic FeS protein with 26 cysteine residues and of unknown cluster composition. The sreE gene encodes a protein with similarity to reductase assembly proteins