Variability is an inherent part of nature. It is omnipresent, especially in the natural world, where diversity is king. Genomes of the various life-forms on earth are, by their very nature, variable. But diversity could not be present without genomic variability. And so it goes that biologists want to understand variability at all of its levels, from the gene to the whole organism. And therein lies the reason why scientists study one form of genetic variability, copy number variation (CNV).
