passages.id: split_8_test_3197_passage
passages.type: progene_text
passages.text: A recombinant enzyme expressed in Escherichia coli catalyzed seven successive decarboxylative condensations of malonyl-CoA to yield aromatic octaketides SEK4 and SEK4b , the longest polyketides known to be synthesized by the structurally simple type III PKS .