C:N balance Journal Article 2 142M471B3J 1 7440-44-0 1 C2 photosynthesis 1 C3–C4 intermediates 1 C4 evolution 1 mehr ... Carbon 1 Carbon Dioxide 1 GABA 1 Glycine 1 N762921K75 1 Nitrogen 1 Pinus taeda (loblolly pine) 1 Research Support, Non-U.S. Gov't 1 TE7660XO1C 1 carbon-concentrating mechanism 1 drought 1 glycine shuttle 1 nitrogen 1 nitrogen sink 1 photorespiration 1 serine 1 stress interactions 1 tricarboxylic acid pathway 1 weniger ...