29455
The important characteristics of the signal transduction system are excitation and adaptation , and the latter implies that the transduction system can function as a " derivative sensor " with respect to the ligand concentration in that the DC component of a signal is ultimately ignored if it is not too large .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None