Fig. 3From: The impact of collagen membranes on 3D gingival fibroblast toroidsAttachment and metabolic activity of gingival fibroblast spheroids on plastic or collagen membranes. Gingival fibroblast spheroids did not show any changes in shape within 72 h, neither on plastic (N = 5) (a) nor on collagen membranes (N = 5) (c). Gingival fibroblast spheroids were metabolically active over the 72 h observation period when seeded on plastic (N = 3) (b) or collagen membranes (N = 3) (d), as shown in relative fluorescence units. Error bars represent standard deviationBack to article page