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(A) Schematic representation of PTB expressed from plasmids pCMVPTB1, pPTBA, and pPTBB. The RNA binding regions (RRMs) are indicated. (B, C, and D) Northern blots of cytoplasmic RNA extracted from HeLa cells transfected with pBELM in the absence or presence of various PTB-expressing plasmids or the Raver1 or Raver2 plasmid as indicated. Blots were probed with the L1 probe and a GAPDH probe. The position of the L1 mRNA is indicated. +, present; −, absent; wt, wild type.
