An author, Marcelo Rubinstein, PhD, was inadvertently omittedfrom the byline of the article entitled "In Vivo ComparativeImaging of Dopamine D2 Knockout and Wild-Type Mice with 11C-Racloprideand MicroPET" (J Nucl Med. 2002;43:15701577). Dr. Rubinsteinis affiliated with the Institute for Genetic Engineering andMolecular Biology, University of Buenos Aires and National ResearchCouncil of Argentina, Buenos Aires, Argentina. The authors regretthe error.