Extracellular

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This refers to anything occurring outside of a cell/cells. This could include the extracellular matrix- this is a complex network of many polysaccharides (e.g. cellulose) and proteins (e.g. collagen) secreted by cells in which the cells are embedded. It could also include extracellular signal molecules- these are any secreted or cell-surface biochemical signal that bind to cell surface receptors and regulates biochemical pathways within the cell. [1]

Reference:

  1. Alberts.B (2007) Molecular Biology of the Cell. Taylor and Francis. (pg G13)
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