Specific Localization of Anti-Rat-Lung Serum in the Lung.

By labelling anti-rat-lung serum with radioiodine and injecting it into rats, it was found that the anti-rat-lung serum contained antibody which localized specifically in the lung. It also contained antibody which cross-reacted with and localized in the kidney. Anti-rat-brain, -liver, and -heart sera were also investigated and showed no specific localization, but these experiments were considered inconclusive.