Isotopic labeling of plasma proteins in vitro by tissues from staphylococcal-infected and control mice was examined, using autoradiography of immunoelectrophoretic patterns. The results indicate that in infected animals there is hyperactivity of liver tissue in producing albumin, α- and ß-globulins, and of spleen tissue in producing immune globulins. The observed increase in labeling of some proteins by tissues from infected mice is to a large extent correlated with an increase of these proteins in the serum.

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