8986
In vitro labeled receptors were incubated with various synthetic or natural agonists or antagonists and submitted to trypsin digestion .
 trypsin, In vitro labeled receptors
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 trypsin, In vitro labeled receptors