Relative change in expression of microRNA-638 and microRNA-923 in A549 cells treated with bostrycin detected by microRNA real time PCR. A549 cells were treated with 10 μM Bostrycin for 72 h and total RNA was isolated for microRNA real time PCR assay. Expression levels of microRNA-638 and microRNA-923 were determined as described. Untreated A549 cells were used as control. Each condition was repeated 4 times.