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Electron Micrograph of a Polysome Chain

Several ribosomes may translate a single mRNA molecule at the same time. The beginning of the mRNA is to the right (at the arrow) and the end is to the left. Note that the synthesized protein molecule can be seen growing longer and longer, the closer the the end of the mRNA the ribosome gets. The protein molecule is most clearly seen at the end of the mRNA (to the right).

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