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. 2007 Jan 31;104(6):1777–1782. doi: 10.1073/pnas.0610772104

Table 1.

H. sapiens Recon 1 network statistics

Component Number
Genes 1,496
Transcripts* 1,905
Proteins 2,004
    Complex-associated reactions* 248
    Isozyme-associated reactions* 946
Intrasystem reactions 3,311
    Metabolic 2,233
    Transport 1,078
Exchange reactions 432
Compartment-specific metabolites 2,712
    Cytoplasm 995
    Extracellular space 388
    Mitochondrion 383
    Golgi apparatus 279
    Endoplasmic reticulum 231
    Lysosome 207
    Peroxisome 139
    Nucleus 90
Citations 1,587
    Primary literature 1,378
    Review articles 188
    Textbooks 21
Validated metabolic functions 288
Knowledge gaps 356

*See Materials and Methods for definitions of transcripts, complexes, and isozymes.

Transport reactions refer to intrasystem transport across a boundary (organellar and plasma membranes), whereas exchange reactions describe metabolite transport across the system boundary, e.g., into and out of the extracellular space from the surrounding medium.

Number of “dead-end” metabolites only produced or consumed.