28213
Further , melting experiments revealed that bound porphyrins do not influence the capsid stability or protein - DNA interactions , but efficiently stabilize the double helical structure of DNA without respect to binding form .
 Chemical: porphyrins
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: porphyrins 
Answer:
 Chemical: porphyrins