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PH-Fibs proliferate at markedly higher rates than CO-Fibs. A and B: cell proliferation under serum-free conditions was assessed by cell number counts (A) and 3-(4,5-dimethylthiozol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay (B) over a 72-h period (see methods). Results are expressed as means ± SE; *P < 0.05; **P < 0.01.
