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Telomerase activity in MEFs. S-100 extracts were prepared from MEFs of the indicated genotype and assayed for telomerase activity. For some genotypes more than 1 MEF was assayed for TRAP activity. Different letters refer to independent MEFs. Extracts were pretreated (+R) or not with RNase. The protein concentration used is indicated. The arrow indicates the internal control (IC) for PCR efficiency.
