1407
With stepwise reductions in flow , the peak ( S ) and trough ( D ) points of the maximum shifted - frequency envelope fell in parallel in a linear fashion until D reached zero .
 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