fotosünteesi biokeemilise faasi kümnes ensümaatilises reaktsioonis toimuv CO2 redutseerumine sahhariidideks, It is a reductive pentose phosphate cycle or C3 cycle is a series of biochemical redox reactions that take place in the stroma of chloroplast in photosynthetic organisms. Calvin-Benson-Bassham cycle (CBB) uses those high energy molecules (ATP and NADPH) to drive the production of glyceraldehyde-3-phosphate (G-3-P). G-3-P can then be used to synthesize hexose sugars which are the primary source of nutrients for heterotrophs.