1. Calvin, M. et al. Carbon dioxide assimilation in plants. Symp. Soc. Exp. Biol. 5, 284–305 (1951).
2. Moore, P. D. Evolution of photosynthetic pathways in flowering plants. Nature 310, 696 (1982).
3. Sage, R. F., Li, M. & Monson, R. K. in C4 Plant Biology (eds Sage, R. F. & Monson, R. K.) 551–584 (Academic, San Diego, 1999).
4. Hatch, M. D. C4 photosynthesis; a unique blend of modified biochemistry, anatomy and ultrastructure. Biochem. Biophys. Acta 895, 81–106 (1987).
5. Reinfelder, J. R., Kraepiel, A. M. L. & Morel, F. M. Unicellular C4 photosynthesis in a marine diatom. Nature 407, 996–999 (2000).