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| Mammalian 28S and 18S rRNA are approximately 5 kb and 2kb in size, the theoretical 28S:18S ratio is approximately 2.7:1. But some 28S rRNAs contain an AU-rich sequence called a ¡°hidden break¡± that can result in processing of these rRNA species into two smaller RNAs. It is likely that similar structural features may be responsible for the ¡°hypersensitivity¡± of the mammalian 28S rRNA relative to the 18S rRNA, resulting in 28S:18S rRNA ratios that are less than the theoretical 2.7:1. |
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