SP effect on cell proliferation at different time-points.

<p>The mean fraction of proliferating (BrdU-positive) tendon cells in human primary cultures after incubation with SP (10⁻⁷ M) was seen to be significantly higher than in cultures not incubated with SP (control) at both 2 and 4 hours of incubation. Error bars represent standard deviation. *<0.05; **p<0.01 (Independent samples t-test).