For more information, see Martinez et al., Neuron 92(4), http://www.cell.com/neuron/fulltext/S0896-6273(16)30655-9. What goes wrong during the devastatin
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The first half of the video illustrates how transcription works. We see DNA transcribed to RNA and learn that some parts of the RNA, the introns, get cut out of the final protein blueprint before it's delivered to the ribosomal protein factories. This is when hnRNP A2/B1 makes its debut: apparently it's important for determining which bits of RNA are discarded. Next we see a ribosome churning out a protein one amino acid at a time.