Undetectable Intracellular Free Copper: The Requirement of a Copper Chaperone for Superoxide Dismutase Rae, T. D. ; Schmidt, P. J. ; Pufahl, R. A. ; Culotta, V. C. ; O'Halloran, T. V. Abstract Publication: Science Pub Date: April 1999 DOI: 10.1126/science.284.5415.805 Bibcode: 1999Sci...284..805R