Rat spleen cells sensitized to bovine serum albumin and treated with anti-lymphocytic IgG are unable to transfer secondary immunological (humoral) responsiveness to irradiated isogeneic rats. Similar treatment of unsensitized spleen cells has a significant, though less marked effect, upon their ability to confer primary humoral responsiveness to irradiated recipients.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1579061PMC

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