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A second year medical student looking to match into a competitive residency joins a laboratory studying gene regulation in a mouse model of hepatocellular carcinoma. He isolates nucleic acids from the cells after exposure to a known carcinogen and has the sequence analyzed. He is surprised to find that some of the nucleotides are Pseudouridine and ribothymidine. Which type of nucleic acid has the student likely isolated?

A. t RNA

B. r RNA

C. hn RNA

D. m RNA

E. sn RNA

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