1. a Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI 48824, USA
2. b Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI 48824, USA
3. c Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI 48824, USA
4. d Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI 48824, USA
5. e Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI 48824, USA
6. f Center for Neural Repair, Department of Neurosciences, University of California, San Diego, CA 92093, USA
7. g Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI 48824, USA
8. h Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI 48824, USA; Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, MI 48824, USA