APS,an extract of polysaccharide from Astragalus mongolicus,increased the spleen weight of normal mice at a dosage of 100mg/kg qd.for 6 days.This effect was significantly decreased in thymectomized mice injected with anti-thymus cell serum(T_x-ATS).APS potentiated significantly both the direct and indirect plaque-forming cells(PFC)in normal mice following SRBC immunization,but it did not potentiate direct PFC in T_x-ATS mice. APS could potentiate d-PFC response to LPS immunization in T_x-ATS mice,but this e...
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