Abstract
Summary
Implantation of donor bursa in hormonally bursectomized chickens restored the immunological reactivity by means of a humoral substance capable of passing through cell-impermeable diffusion chambers. Lym-phocytic nodules, shown to develop under the influence of the humoral agent from the bursa, are felt, in part, to be the site of antibody production. Plasma cell development does not appear to be by means of the humoral substance alone.
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