level1 level2 Count Metabolism Metabolic pathways 9.52 Metabolism Biosynthesis of secondary metabolites 4.26 Metabolism Microbial metabolism in diverse environments 2.78 Metabolism Carbon metabolism 2.05 Metabolism Biosynthesis of amino acids 1.75 Metabolism Purine metabolism 1.26 Metabolism Glycolysis / Gluconeogenesis 1.04 Metabolism Pyrimidine metabolism 0.9 Metabolism Oxidative phosphorylation 0.74 Metabolism Pyruvate metabolism 0.74 Metabolism Methane metabolism 0.57 Metabolism Fatty acid metabolism 0.54 Metabolism Carbon fixation in photosynthetic organisms 0.53 Metabolism Glycine, serine and threonine metabolism 0.52 Metabolism Amino sugar and nucleotide sugar metabolism 0.5 Organismal Systems Thermogenesis 0.89 Organismal Systems Insulin signaling pathway 0.75 Organismal Systems Glucagon signaling pathway 0.65 Organismal Systems Oxytocin signaling pathway 0.55 Organismal Systems Dopaminergic synapse 0.51 Organismal Systems Thyroid hormone signaling pathway 0.48 Organismal Systems Progesterone-mediated oocyte maturation 0.47 Organismal Systems Adrenergic signaling in cardiomyocytes 0.46 Organismal Systems Retrograde endocannabinoid signaling 0.4 Organismal Systems Estrogen signaling pathway 0.39 Organismal Systems Vascular smooth muscle contraction 0.38 Organismal Systems Platelet activation 0.38 Organismal Systems Circadian entrainment 0.37 Organismal Systems NOD-like receptor signaling pathway 0.36 Organismal Systems Longevity regulating pathway - multiple species 0.35 Environmental Information Processing PI3K-Akt signaling pathway 0.7 Environmental Information Processing mTOR signaling pathway 0.68 Environmental Information Processing AMPK signaling pathway 0.64 Environmental Information Processing MAPK signaling pathway 0.53 Environmental Information Processing Wnt signaling pathway 0.48 Environmental Information Processing cAMP signaling pathway 0.46 Environmental Information Processing Phosphatidylinositol signaling system 0.46 Environmental Information Processing FoxO signaling pathway 0.43 Environmental Information Processing Apelin signaling pathway 0.43 Environmental Information Processing HIF-1 signaling pathway 0.42 Environmental Information Processing ABC transporters 0.42 Environmental Information Processing cGMP-PKG signaling pathway 0.4 Environmental Information Processing Two-component system 0.36 Environmental Information Processing Ras signaling pathway 0.35 Environmental Information Processing MAPK signaling pathway - yeast 0.32 Cellular Processes Cell cycle 0.84 Cellular Processes Cell cycle - yeast 0.79 Cellular Processes Endocytosis 0.74 Cellular Processes Oocyte meiosis 0.72 Cellular Processes Autophagy - animal 0.68 Cellular Processes Meiosis - yeast 0.67 Cellular Processes Cellular senescence 0.66 Cellular Processes Lysosome 0.64 Cellular Processes Autophagy - yeast 0.57 Cellular Processes Phagosome 0.53 Cellular Processes Peroxisome 0.49 Cellular Processes Apoptosis - fly 0.45 Cellular Processes Apoptosis 0.44 Cellular Processes Focal adhesion 0.41 Cellular Processes Tight junction 0.32 Genetic Information Processing RNA transport 1.24 Genetic Information Processing Protein processing in endoplasmic reticulum 1.06 Genetic Information Processing Spliceosome 1.01 Genetic Information Processing Ribosome 0.87 Genetic Information Processing Ribosome biogenesis in eukaryotes 0.81 Genetic Information Processing RNA degradation 0.81 Genetic Information Processing mRNA surveillance pathway 0.68 Genetic Information Processing Aminoacyl-tRNA biosynthesis 0.68 Genetic Information Processing Ubiquitin mediated proteolysis 0.59 Genetic Information Processing Fanconi anemia pathway 0.56 Genetic Information Processing Nucleotide excision repair 0.47 Genetic Information Processing Homologous recombination 0.47 Genetic Information Processing DNA replication 0.42 Genetic Information Processing Proteasome 0.37 Genetic Information Processing Mismatch repair 0.29