Journal Article Research Support, Non-U.S. Gov't 142M471B3J Arthropogoninae C2 Kranz anatomy C2 photosynthesis C4 engineering C4 photosynthesis CO2 concentrating mechanism Carbon Dioxide Carbon Isotopes Comparative Study EC 1.1.1.37 EC 1.1.1.38 EC 1.4.4.2 EC 4.1.1.31 EC 4.1.1.39 Glycine Dehydrogenase (Decarboxylating) Homolepis. Malate Dehydrogenase Phosphoenolpyruvate Carboxylase Plant Proteins Ribulose-Bisphosphate Carboxylase Rubisco. bundle sheath glycine decarboxylase grasses malate dehydrogenase-(oxaloacetate-decarboxylating) (NAD+) mitochondria photosynthetic hybrids