SEARCH Articles Figures Tables Autotrophic Carbon Fixation in Biology Pathways, Rules, and Speculations Carbon atmospheric pathways Carbon cycle microbial pathways Carbon cycle pathways Carbon dioxide Hatch-Slack pathway Carbon dioxide production pentose phosphate pathway Carbon flux amino acid biosynthetic pathway Carbon reduction secondary pathways Organic Carbon Pathways in the Ocean Pathways, for carbon dioxide reduction Serine pathway one-carbon compound assimilation