ANTONIO ROMERO / SCIENCE PHOTO LIBRARY ANTONIO ROMERO / SCIENCE PHOTO LIBRARY
Adenine crystals. Polarized light micrograph of crystals of the purine nucleobase adenine. This molecule has several roles in biochemistry including forming a nucleotide of DNA, the basis of the genetic code. It is also involved in cellular respiration and protein synthesis. Field of view size: 0.15 x 0.22 millimetres.
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