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The nested double-pseudoknot motif is also common in cellular ribozymes (Supplementary information S2 (table)), for example, the HDV-like ribozyme present in an intron of the gene that encodes ...

Eric Katz writes about federal agency operations and management. His deep coverage of Veterans Affairs, Homeland Security, the Environmental Protection ...

In economics, scarcity is a shortage in the supply of a resource that forces up its price, reducing its distribution to the consumers willing to pay a higher price.