RUSSELL KIGHTLEY / SCIENCE PHOTO LIBRARY RUSSELL KIGHTLEY / SCIENCE PHOTO LIBRARY
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Protein synthesis in cell. Cutaway artwork of the inside of a cell, showing proteins (pink, one at bottom left) being synthesized by ribosomes (blue, one at lower left). The instructions for building the proteins are encoded in strands of messenger ribonucleic acid (mRNA, yellow). DNA (deoxyribonucleic acid, in the nucleus). Transfer RNA (tRNA, orange strands) brings amino acids (pink) to a ribosome, where they are joined in a sequence determined by the mRNA. Different sequences produce different proteins. The cell membrane, with transmembrane proteins (lumps, upper right), is also seen.
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