Figure 1. A, Expression of microRNA-21 (miR-21) from patients with intervertebral disc degeneration (IDD) and from normal controls. B, miR-21 expression from healthy controls and patients with Pfirrmann III, IV, V; C, programmed cell death 4 mRNA (PDCD4) expression in healthy controls and IDD patients; D, correlation analysis of miR-21 expression and Pfirrmann grades. *P<0.05, compared with normal controls (Student t-test).
