BioScience Dictionary

 
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Found Focus-forming assay 1 time.

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1. Focus-forming assay
A lab technique used to find out if a particular piece of DNA contains oncogene s ( gene s which are associated with cancer ). This is done by putting the DNA into animal cell s which normally show contact inhibition , or which stop growing when they come into physical contact with other cells or reach a certain density in the culture . If the cells lose contact inhibition and form areas of densely-packed cells (called foci) after receiving the DNA, it means that the DNA did contain oncogenes.