close up circular dna helix strand

organ plasmid small circular dna molecule found bacteria microscopic organisms rendering close helix strand helix biology dna molecular structure science circle magnification biotechnology research technology chromosome medicine spiral healthcare medicine molecule abstract people evolution biochemistry symbol chemistry cloning twisted atom shape genetic three dimensional design three objects genetic research plasmid genetic modification engineering backgrounds science technology laboratory scientific experiment biomedical gene therapy genetic mutation biological cell biological process biochemical weapon dna virus dna test dna microarrayer medical clinic editing equipment recombination