Liver cells

... has found a theory of life which suggests that a decent percentage of cells in a multi-cellular organism doesn't contribute to the organism as ... cells of the islets-of-langerhans synthesise insulin, not all liver cells secrete bile etc etc I know nothing worthy of mentioning about ...

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... reply, the main thing is i cant really find any explanation on why some cells stop dividing, as you said nerve cells (mainly in the brain), cardiac cells and liver cells, why is it they stop dividing? are they just not programmed to do this?

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... to some degree. Best examples probably are epithelial tissue and blood cells, but interestingly also liver can regenerate (being the only internal organ able to do so): only a small bit of liver ...

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... is metabolized such as: 1. Histidine is converted to urocanate in the liver or skin. In skin urocanic acid is produced to absorb UV rays. 2. In ... 3. Decarboxylation into histamine which is found predominately in mast cells and plays important roles in immune function and as a paracrine agent ...

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... your example: the gene that codes for the production of insulin in a liver cell is "on", while in your ear cells, the gene is "off". :)

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