Abstract
The combination of 2 bacterial polysaccharides, Piromen and dextran, given intraperitoneally as two injections, increases survival in mice receiving 700 r to total-body X-irradiation. They are effective when they are administered 24 hours prior to X-irradiation and also when they are administered 24 hours after X-irradiation. If dextran and Piromen are mixed in vitro and administered as one injection, they are ineffective in modifying the survival of the irradiated mice.

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