ChAPTER 3 Implants to Facilitate Tissue/Organ regeneration 3. 1 The Problem of the Missing Organ; Solutions 3.1 Regeneration versus Repair 3.2 Matrices for Tissue Regeneration 3.2. 1 Chemistry 3.2.1.1 Synthetic Polymers 3.2. 1 2 Analogs of Extracellular Matrix: Collagen-GAG Copolymers 3.2.2 Pore Characteristics 3.2.3 Degradation RateCHAPTER 3 Implants to Facilitate Tissue/Organ Regeneration 3.1 The Problem of the Missing Organ; Solutions 3.1 Regeneration versus Repair 3.2 Matrices for Tissue Regeneration 3.2.1 Chemistry 3.2.1.1 Synthetic Polymers 3.2.1.2 Analogs of Extracellular Matrix: Collagen-GAG Copolymers 3.2.2 Pore Characteristics 3.2.3 Degradation Rate