24960
Proteins identified of the naphthalene degradation pathway showed a relative ( 13 ) C isotope abundance of approximately 50 atom % demonstrating that the identified naphthalene degrading bacteria gained at least 80 % of their carbon by PAH degradation .
 Chemical: naphthalene; Chemical: ( 13 ) C; Chemical: naphthalene; Chemical: carbon; Chemical: PAH
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: naphthalene; Chemical: ( 13 ) C; Chemical: naphthalene; Chemical: carbon; Chemical: PAH