DNAJB4 and breast carcinoma: To explore the functional role of DNAJB4 in breast cancer cells, we stably knocked down the expression of DNAJB4 via two DNAJB4-specific lentiviral shRNAs (shDNAJB4 #1 and shDNAJB4 #2) in MDA-MB-231 and BT-549 cells.