28784
Data on gene transcription and catalytic activities should be carefully interpreted when assessing the impact of chemical pollutants and additional studies are needed on modulation of post - transcriptional mechanisms by environmental stressors .
 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