c-Type cytochrome biogenesis can occur via a natural Ccm system lacking CcmH, CcmG, and the heme-binding histidine of CcmE (vol 285, pg 22882, 2010) - Goddard,AD; Stevens,JM; Rao,F; Mavridou,DAI; Chan,W; Richardson,DJ; Allen,JWA; Ferguson,SJ (JOURNAL OF BIOLOGICAL CHEMISTRY, 2011)