M13 Virus

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M13 is a bacteriophage, a virus that infects bacteria. It consists of a protein capsid containing circular single-strand DNA. The DNA is comprised of 6407 nucleotides. The protein capsid is formed from a couple thousand copies of a 50-amino-acid protein called P8. The size of the wild virus is a cylinder about 1<math>\mu</math>n in length and ~10nm in diameter; however, the size of the virus adapts to hold the amount of DNA it stores and can therefore be variable. M13 infects the E. Coli bacteria and is of significant interest and use in research utilizing recombinant DNA and phage displays.

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