[tag=WDT] [word=genes] [lemma=□]
[tag=WDT] [word=genes] [lemma=be]
Publicly available at no-cost , the map show which genes are active or “ expressed ” within the brain , and which regions and cells they are expressed in . These kinds of studies also reveal which genes are intimately involved in the normal progression of a fertilized egg to a healthy offspring . To a large extent , the packaging of DNA designs the cells and presages their functions by controlling which genes are turned on or off during development . The fascinating gap in knowledge for me is that we do n't really understand which genes were selected for. " " We speculate that the milk production is regulated hormonally , " he says . “ We were looking at which genes are getting turned on and off and which signals are turning which genes on and off — and how that changes over time during the development of an embryo . So-called gene , or DNA , chips can reveal the activity of messenger RNA and , thus , which genes are most active in a normal or diseased cell . Memes are to culture what genes are to biology . They used DNA microarrays — small chips that expose in one swoop the activity of every known human gene in a particular tissue — to record which genes were boosted or repressed by each drug.The team entered the results of these microarrays into a database .