title: Human periodontal ligament in vitro: cell culture passage effect on collagen gel contraction.
mesh_terms: D002452:Cell Count; D002455:Cell Division; D002465:Cell Movement; D002478:Cells, Cultured; D003094:Collagen; D005347:Fibroblasts / Q000502:physiology*; D005782:Gels; D005881:Gingiva / Q000166:cytology; D006801:Humans; D010513:Periodontal Ligament / Q000166:cytology*; D012590:Sclera / Q000166:cytology; D012867:Skin / Q000166:cytology
chemical_list: D005782:Gels; D003094:Collagen