797
Terbutaline ; a beta2 - adrenergic agonist , and aminophyllin , a phosphodiesterase inhibitor , were given separately , or in combination , to rabbit fetuses on the 28th day of gestation .
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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