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Tissue oxygen pressure measurements for transplanted tumors by the Eppendorf microelectrode. Tumor-bearing SCID mice were anesthesized and immobilized on a heating pad. Sequential measurements were done for each tumor before (A) and after (B) 10% O2 breathing. The data are shown as pooled histograms. The two groups were significantly different (P<.01) (Mann-Whitney rank sum test).
