1. Department of Biology, Skeletal Research Center, Case Western Reserve University, Cleveland, Ohio.
2. CWRU Center for Multimodal Evaluation of Engineered Cartilage, Cleveland, Ohio.
3. Division of Sports Medicine, Department of Orthopaedics, Diabetes Research Institute and Cell Transplant Center, University of Miami, Miller School of Medicine, Miami, Florida.
4. BioTime, Inc., Alameda, California.
5. Department of Genetics and Genome Sciences, School of Medicine, Case Western Reserve University, Cleveland, Ohio.