Human Periodontal Ligament Fibroblasts (HPdLF) are isolated from the ligament that fastens the molars to the jaw bone. Human Periodontal Ligament Fibroblasts are guaranteed through 10 population doublings and to stain negative for pan cytokeratin. All cells test negative for mycoplasma, bacteria, yeast, and fungi. HIV-1, hepatitis B and hepatitis C are not detected for all donors and/or cell lots. A Certificate of Analysis is provided for each cell lot purchased.