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Oxygen tension of the small lymph vessels ( PLO2 ) of the rabbit hind limb was measured with both a flow - through micro chamber and a polarographic catheter - tip oxygen electrode to obtain experimental data on the source of oxygen in the lymph .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 None