Immunity to a syngeneic sarcoma induced in rats by dendritic lymph cells exposed to the tumour either in vivo or in vitro.

Their generally non-adherent and non- phagocytic nature in in vitro systems (which may be caused partly by the anticoagulants necessary for their collection) could be one reason why our attempts to "sensitize' them to the tumour in vitro were only partially successful. It may be significant that the lymph from tumour bearing rats contained fewer of these cells than that from non- tumour bearers.

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