Figure 4. Figure 4. (A–E) RT-qPCR verified the efficiency of knocking down hsa_circ_0072389, hsa_circ_0072386, hsa_circ_0008621, hsa_circ_0072387, hsa_circ_0072391 in glioma U251, respectively. (F) RT-qPCR verified the efficiency of miR-338-5p inhibitor on miR-338-5p expression inhibition. (G) Western blot shown the effect of hsa_circ_0072389, hsa_circ_0072386, hsa_circ_0008621, hsa_circ_0072387, hsa_circ_0072391, miR-338-5p on IKBIP protein expression.