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a large web-based map focusing on the analysis of protein sequences & structures.
in case you really want to know: enzymes are shown in blue, coenzymes are shown in red, other reaction participants in black. the color of the arrows shows type of organism in which the reaction was observed or is likely to occur (blue:animals, green: plants, red: unicellular organisms). dashed arrows are used for catabolic pathways, continuous lines for anabolic & bidirectional (amphibolic) pathways. regulatory effects are shown in orange.
see also chemical galaxy.
[expasy.org & expasy.org]