<p>(<b>A,B</b>) Quantitative Northern blot to determine miR-17~92 miRNA copy numbers. Indicated amounts of synthetic miR-17, miR-18a, miR-19b and miR-92 were added to naïve and activated TKO B cells before RNA extraction. The copy numbers of each miRNA subfamily were determined by Northern blot comparing WT B cells and TKO B cells with graded amounts of spike-in synthetic miRNAs, using a mixture of probes corresponding to all members of a miRNA subfamily (also see <b><a href="http://www.plosgenetics.org/article/info:doi/10.1371/journal.pgen.1006623#pgen.1006623.s029" target="_blank">S7 Table</a></b>). Naïve B cells were activated with LPS and IL-4 for indicated amounts of time (h, hour). (<b>C-E</b>) Summary of miR-17~92 family miRNA copy numbers (<b>C</b>), conserved miR-17~92 family miRNA binding sites (<b>D</b>) (also see <b><a href="http://www.plosgenetics.org/article/info:doi/10.1371/journal.pgen.1006623#pgen.1006623.s030" target="_blank">S8 Table</a></b>), and ratios of conserved miR-17~92 family miRNA binding sites to miRNAs (<b>E</b>) in naïve and activated B cells.</p

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