CPC migration analyzed by scratch assay. Confluent chondrogenic progenitor cells (CPC) were scratched, incubated with or without interleukin (IL)-1β (1 ng/ml) or tumor necrosis factor (TNF)-α (10 ng/ml) and documented by phase contrast microscopy after the indicated time points. The bars indicate 200 μm. Representative pictures of four independent experiments are shown.
Joos et al. Arthritis Research & Therapy 2013 15:R119 doi:10.1186/ar4299