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Partial tissue oxygen tension ( PtO ( 2 ) ) was measured with polarographic microprobes ; epithelial metabolism was monitored by microdialysis inside the TET epithelium perfused with the medium underneath .
 tissue, epithelial, TET epithelium
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
 tissue, epithelial, TET epithelium