Figure 2.
Analysis of specificity of miR-222 stem-loop RT-PCR. Lane A, 5 µg of total RNA; lane B, RNA (<200 nt) isolated from 5 µg of total RNA; lane C, miRNA precursor (60–100 nt) isolated from 5 µg of total RNA by 15% PAGE; lane D, mature miRNA (18–24 nt) isolated from 5 µg of total RNA by 15% PAGE. PCR with 30 cycles provided a faint band of miRNA precursor, while PCR with 22 cycles failed to show this band.