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Pregnant New Zealand White rabbits were exposed to hypobaric hypoxia ( 15 , 000 ft x 36 h ) to alter fetal O ( 2 ) tension or were maintained in room air .
 Anatomy: fetal
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Anatomy 
Text: {0} 
Answer:
 Anatomy: fetal