RABBIT ANTIBODIES 99 reaction with duck ovalbumin was similar in all fractions.6. The findings suggest that different cells, capable of producing slightly different globulins, may predominate in antibody production according to the route of injection and duration of the antigenic stimulus.We wish to thank Dr A. Isaacs of this Institute for preparing the anti-influenza serum and for carrying out the agglutinin inhibition assays, as well as for his most valuable interest in this work. We are also grateful to Miss J. Morgan for excellent technical assistance, including many hours spent at -70. REFERENCES

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