Effect of conditioning radiation dose on NBr marrow grafting in Lewis rats.

Four groups of 9 Lewis rats received 2 × 10⁵ NBr marrow cells 2 hours following irradiation. Groups of 2 to 3 Lewis rats that were irradiated, but not grafted, are labeled control (C). TBI⁶⁰Co doses are listed on the x-axis. Rats were assayed 12 weeks after grafting. Solid bar (▪) indicates positive recipients; open bar (■), negative recipients; and striped bar (▥), rats not surviving.