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> > David: QUOTE (my bold): [i]But one central question remains unanswered – [b]how does a cell know [/b]which combination of the 20,000 genes it should activate to produce its specific toolkit?
> > "The answer to this question may be found in the pieces of DNA that lie between our protein-producing genes. Although our cells contain a lot of DNA, only a small part of this is actually composed of genes. We don't really understand the function of most of this other sequence, but we do know that some of it has a function in regulating the activity of genes.
> > An important class of such regulatory DNA sequences are the enhancers, which act as switches that can turn genes on in the cells where they are required.
> > "However, we still don't understand [b]how these enhancers know[/b] which genes should be activated in which cells.[/i]” 
> > 
> > dhw: How do cells know xyz? Great question. Maybe they have an intelligence of their own. Just a thought!;-)
> 
> Like good little soldiers they follow instructions in  their genome.