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Total alkaline phosphatase activity mean±S.D. per cell-seeded disk for 4 individual rat and 4 individual human samples (n=2 per sample) grown in osteogenic medium (standard medium with asc plus dex). There is large variability between individuals. Rat samples seeded on 45S5 bioactive glass show higher alkaline phosphatase activity than samples on tissue culture plastic (paired t-test p<0.05). Human samples do not show any consistent differences. Note different y axis scales.
