text: The domains in the polyketide synthase type I:
  * ACP: acyl carrier protein (serves as chaperone)
  * AT: acyl transferase  (transfers acyl group form CoA to ACP)
  * KS: keto synthase  (forms the new carbon-carbon bond)
  * KR: keto reductase  (NADPH-dependent reduces beta-ketone to beta-hydroxyl)
  * DH: dehydratase  (eliminates beta-OH to anpha/beta-unsaturation)
  * ER: enoyl reductase  (NADPH-dependent reduces anpha/beta-unsaturation)
  * TE: thioesterase  (hydrolyses / cyclizes)