Source:http://linkedlifedata.com/resource/umls/id/C1159421
GO: The reduction of sulfate to hydrogen sulfide, which acts as a terminal electron acceptor. Sulfate is activated to adenosine-phosphosulfate (APS) which is then reduced to sulfite, which is in turn reduced to hydrogen sulfide. [GOC:jl, MetaCyc:DISSULFRED-PWY]