Supramolecular Protein Cage Composite MR Contrast Agents with Extremely Efficient Relaxivity Properties Liepold, Lars O. ; Abedin, Md Joynal ; Buckhouse, Emily D. ; Frank, Joseph A. ; Young, Mark J. ; Douglas, Trevor Abstract Publication: Nano Letters Pub Date: December 2009 DOI: 10.1021/nl902884p Bibcode: 2009NanoL...9.4520L