Cat and rat experiments show that the protein fraction isolated from b
lood serum of the Greenland seal has a protective activity against mot
ion sickness. This activity is comparable to that of the classical ves
tibuloprotector scopolamine and is greater than that of diprazine. Rad
ioligand assay of the receptor binding showed that the serum protein f
raction has the highest affinity for alpha(2)-adrenoreceptors, mu-opio
id, and benzodiazepine receptors.