1928
The BAL - to - plasma specific activity of urea was about twice that of Na + , indicating that urea diffused into the ELF more rapidly than Na + during the 70 s that elapsed between the time the radioactive urea and Na + were injected into the circulation and the time when lavage was complete .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
 Entities:  
Answer:
 None