FIG. 1.

Schematic representation of the alignment of oligonucleotide primers with the Tetrahymena telomerase RNA template region and extension of these primers by a single nucleotide residue. (A) Scheme showing the alignment of primers ending with the sequence GGG-3′ along the telomerase RNA template region and their extension by a single ³²P-labeled dGMP residue (g*). (B) Scheme showing the alignment of primers ending with the sequence GGGGT-3′ along the telomerase RNA template region and their extension by a single ³²P-labeled dTMP residue (t*).