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Fig. 3. Effects of a stepwise decrease in water oxygen partial pressure (PO2) on absolute (GI) and relative (GI/) gastrointestinal blood flow before (open columns) and after feeding (filled columns). Values are means ± S.E.M. (N=7). Asterisks indicate a significant difference between control (unfed) and fed group, daggers indicate significant differences from previous hypoxia level.