2 Fe(III)-[cytochrome c3] + hydrogen sulfide + sulfite <=> 2 Fe(II)-[cytochrome c3] + thiosulfate
2 fe(iii)-[cytochrome c3] + hydrogen sulfide + sulfite <=> 2 fe(ii)-[cytochrome c3] + thiosulfate
2 Fe(III)-[cytochrome c3] + hydrogen sulfide + sulfite <=> 2 Fe(II)-[cytochrome c3] + thiosulfate
2 fe(iii)-[cytochrome c3] + hydrogen sulfide + sulfite <=> 2 fe(ii)-[cytochrome c3] + thiosulfate