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Gene expression patterns in human NP cells following infection by Ad-GDF-5, Ad-GFP, or no adenovirus (BM group) over 3, 7, 14, and 21 d
(a) Collagen II mRNA levels; (b) Aggrecan mRNA levels. Data points are presented as mean±SD (n=6). * P<0.05, ** P<0.01, vs. BM group; # P<0.05, ## P<0.01, vs. Ad-GFP group
