peamiselt taimedes, protistides, seentes ning bakterites esinev tsitraaditsükli teisend, A variation of the citric acid cycle, occurring in plants, bacteria, protists, and fungi. Enables using simpler compounds such as AcetylCoA and succinate for saccharide synthesis in place of hexoses. The cycle needs two additional enzymes - malate synthase and isocitrate lyase.