93581
Depending on the tissue type and the method of antigen detection , endogenous biotin or enzymes may need to be blocked or quenched , respectively , prior to antibody staining .
 biotin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 biotin