The order of modules and domains of a complete nonribosomal peptide synthetase is as follows:
* Initiation or Starting module: [F/NMT]-A-PCP-
* Elongation or Extending modules: -(C/Cy)-[NMT]-A-PCP-[E]-
* Termination or Releasing module: -(TE/R)
(Order: N-terminus to C-terminus; []: optionally; (): alternatively)