Analysis of hnRNP A1 depletion in HTLV-1 producing C91PL cells. (A) Analysis of hnRNP A1 mRNA levels in cells transduced with the indicated retroviruses. Four days after transduction, cytoplasmic RNA were extracted, reverse transcribed with oligo-dT, and levels of hnRNP A1 mRNA were determined by RQ-PCR. (B) Expression of hnRNP A1, Rex and hnRNP C1/C2 was monitored by immunoblotting of total protein extract from C91PL cells transduced with the indicated virus. Equivalent protein loading was confirmed by immunoblotting with an anti-actin antibody. (C) Detection of hnRNP A1 and p19gag expression in C91PL cells transduced with the indicated virus. Dot plots showing both hnRNP A1 and HTLV-1 gag expressions in one representative experiment. The percentage of cells in each quadrant is indicated.