In Bacillus megaterium and Bacillus subtilis, POR is a C-terminal domain of CYP102, a single-polypeptide self-sufficient soluble P450 system (P450 is an N-terminal domain).
In Bacillus megaterium and Bacillus subtilis, the POR domain corresponds to the C-terminal section of CYP102, constituting a single-polypeptide self-sufficient soluble P450 system (P450 being the N-terminal segment).