8502
Domain - specific RT - PCR experiments demonstrated that transcripts corresponding to domains I and V , including endorepellin , were present ; however , mRNA transcripts corresponding to regions of domain III were not present , suggesting that these cells were capable of producing spliced forms of the protein core .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 None