monkey periodontal ligament fibroblasts ( mplf cells ) , human gingival fibroblasts ( hgf cells ) , rat embryonic calvaria cells ( rec cells ) , porcine periodontal ligament epithelial cells ( pple cells ) and rat osteosarcoma 17/2 cells ( ros cells ) were incorporated into 3-dimensional collagen gels plated in 60 mm petri dishes in order : first , to measure the capacity of these cell types to contract ;
C0016030
fibroblasts
C0007634
cells