Fig. 5.
Telomerase activity in one serially transplantedPax5−/− pre-B I cell clone.
Photometric enzyme immunoassay with telomeric repeat amplification was used to determine telomerase activity in (●) the primaryPax5−/− pre-B I cell clone after 35 divisions; (⧫) hexagonary Pax5−/− pre-B I cell clone after 192 divisions in vitro; and (Δ) HEK293 cells (positive control) or (■) heat-inactivated HEK293 cells (negative control).