Expression of a gene
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Expression of a gene: reading a genetic information from DNA to make a new protein (see DNA and RNA). Every cell contains every gene of the individual, but only some are expressed in any particular cell, and often only at a particular time. Proteins involved e.g. in the synthesis of skin pigment are expressed only in certain layers of the skin, and not in the gut; even in the skin the rate of expression depends on the stimulation by sunlight. 
- Jouko Tuomisto, Terttu Vartiainen and Jouni T. Tuomisto: Dioxin synopsis. Report. National Institute for Health and Welfare (THL), ISSN 1798-0089 ; 14/2011