No gene encoding the mandatory enzyme (APS kinase). This may have resulted in the summary the pathway is incomplete. Nevertheless, as opposed to what is predicted in preceding annotations, the products of cysH is likely to be a PAPS reductase rather than an APS reductase since it is most intently associated to genes encoding APS reductases in alphaproteobacteria this sort of as Sinorhizobium meliloti and…