19634
Relevant effects may not be identified in animal studies when the effects are delayed , life stage specific , not assessed by the experimental paradigm ( e . g . , behaviour ) or only occur when an organism has to adapt to environmental factors by modulating TH levels .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None