Developmental regulation of the transgenic hTERT and endogenous mTERT promoters. Total RNAs were isolated from tissues and organs at different developmental stages. Levels of Rluc and mTERT mRNAs were measured by qRT-PCR, normalized to 18S rRNA. Data are shown as percentages of those in iPSC clone III-9. A) Limb and tail tips. B) Kidney, brain, lung, and heart. C) Testis, ovary, and thymus.