Fig. 4

Attachment and metabolic activity of gingival fibroblast monolayers on plastic or collagen membranes. Gingival fibroblast monolayers 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 monolayers 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 deviation