Figure 3.

Precursor and cleavage point of a tailless retropseudogene from an intron-containing tRNA. In an example where human pre-tRNA^Tyr serves as a precursor for a tailless retropseudogene, the RNA breakpoint 3′ to a purine residue (arrow) is located in the intron (lower case letters). The priming site, also located in the intron, is boxed. The boxed nucleotides at the 5′-end represent unprocessed nucleotides that are present in the integrated tailless retropseudogene. Nucleotides representing the remainder of the tRNA precursor, but not part of the tailless retropseudogene, are depicted by “thin” letters.