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)