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Proteoglycan and DNA content during culture in unconditioned, conditioned serum or conditioned serum with Etanercept (mean +/- SD). Proteoglycan (PG) metabolism in the presence of unconditioned serum (control, n = 8), conditioned serum (CS, n = 8) or conditioned serum with etanercept (n = 8). (a) PG content, (b) DNA content, (c) PG/DNA ratio.
