7.1 ELEMENTS OF TISSUE ENGINEERING MATRICES (porous structures) Synthetic Polymers(absorbable) Polyactic acid Polyglycolic acid Natural Polymers(absorbable) Collagen(types l,Il, I,Iv) Collagen -GAG copolymer Fibrin Chitosa Synthetic Polymer(nonresorbable) PTFE Calcium Phosphate Natural minera Bone minera CELLS autole Marrow Stromal stem Cell Phenotypically Altered Cells Genetically altered Cells SOLUBLE REGULATOPRS Growth Factors(polypeptide mitogens) rs(e.g, BMP7.1 ELEMENTS OF TISSUE ENGINEERING MATRICES (porous structures) Synthetic Polymers (absorbable) Polyactic acid Polyglycolic acid Natural Polymers (absorbable) Collagen (Types I, II, III, IV) Collagen - GAG copolymer Fibrin Chitosan Synthetic Polymer (nonresorbable) PTFE Synthetic Ceramics Calcium Phosphate Natural Mineral Bone Mineral CELLS Autologous Allogenic Marrow Stromal Stem Cell Phenotypically Altered Cells Genetically Altered Cells SOLUBLE REGULATOPRS Growth Factors (polypeptide mitogens) Differentiation Factors (e.g., BMP)