3658
UDP - glucuronosyltransferase A1 ( UGT2A1 ) is expressed in the lung and exhibits activity against polycyclic aromatic hydrocarbons ( PAHs ) , suggesting UGT2A1 involvement in the local metabolism of PAH tobacco carcinogens .
 UDP, polycyclic aromatic hydrocarbons, PAHs, PAH
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 UDP, polycyclic aromatic hydrocarbons, PAHs, PAH