394
Gastric CO2 / HCO3 was determined in absence of simultaneous inhibition of acid secretion by intra - and extragastric pCO2 / pH measurements in 23 persons and calculated using the equation of Henderson - Hasselbalch . pCO2 was measured with use of a new electrode .
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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