Teleomere fluorescence.

Telomere fluorescence is shown from subclone G11.8 transduced with the GFP vector (A-D) and subclone T11.9 transduced with the hTERT/GFP construct (E-F). At each cloning step (II-V), the telomere fluorescence of a representative clone is depicted. The telomere fluorescence was calculated by subtracting the mean background fluorescence from the mean fluorescence obtained with the telomere probe and is expressed in kMESF units as described in “Material and methods” (1 kMESF unit corresponds to approximately 0.5 kb).