Activation factor which mediates telomerase activity and potentiates responses to auxin through the regulation of BT2. Binds in vitro to the DNA sequence 5'-GACAGTGTTAC-3' of the BT2 promoter. Preferentially expressed in roots and flowers. Slightly expressed in leaves and stems. Contains a slightly degenerated ERF-associated amphiphilic repression (EAR) motif, which may be involved in the activity of transcriptional repression. Altered response to auxin, but persistance of the telomerase activity.