Metabolic activity after SP incubation.

<p>Incubating human tendon cells with SP (10⁻⁷ M) for 48 hours significantly increases their metabolic activity compared to incubation with pure cell culture media or PBS. The potency of SP as a proliferative factor is about half that of cell culture media with 10% fetal calf serum (FCS). As another positive reference, results from incubation with a cell culture medium with a serum-free growth factor (Q333) are shown. Results from MTS-assay analysis. Serum-free media set as standard to 1. Error bars represent standard deviation. **p<0.01.