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Protein synthesis, illustration
Illustration showing proteins (red) being synthesised by ribosomes (dark purple spheres) receiving mRNA (messenger ribonucleic acid, purple and green strands). The instructions for building the proteins are encoded in these strands of mRNA that originate in the cell nucleus (green, centre), and is a copy of the information coded in DNA (deoxyribonucleic acid) in the nucleus. The mRNA is shown emerging from nuclear pores., by KEITH CHAMBERS/SCIENCE PHOTO LIBRARY
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