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(a) Experimental scheme: nucleus pulposus (NP) tissue differentiation for additional 4 weeks (annulus fibrosus [AF]-NP 4 weeks) after AF tissue induction for 2 weeks (AF 2 weeks), (b) biphasic intervertebral disk (IVD) structure (silk scaffold combined with fibrin/hyaluronic acid [HA] gel) using porcine-derived AF cells and chondrocytes. Color images available online at www.liebertonline.com/tea
