The tandem gene clusters orfR-ombB-omaB-omcB and orfS-ombC-omaC-omcC of the metal-reducing bacterium Geobacter sulfurreducens PCA are responsible for trans-outer membrane electron transfer during extracellular reduction of Fe(III)-citrate and ferrihydrite [a poorly crystalline Fe(III) oxide]. Each gene cluster encodes a putative transcriptional factor (OrfR/OrfS). a porin-like outer-m... https://www.markbroyard.com/quick-sale-savannah-tropic-pure-argan-oil-hair-serum-125ml-oos-on-sale-mega-super/