Figure 2From: Fibroblasts and monocyte macrophages contract and degrade three-dimensional collagen gels in extended co-cultureEffect of neutrophil elastase (NE) on collagen degradation in gels with co-cultured human fetal lung fibroblasts (HFL) and blood monocytes (BM).Gels were harvested on day 4 and collagen content was determined by measuring hydroxyproline. Vertical axis: Hydroxyproline content (μg/gel). Horizontal axis: culture conditions. *P < 0.05, **P < 0.01.Back to article page