104817
Thanks to the work of Robert Remak and Rudolf Virchow , however , by the 1860 s most biologists accepted all three tenets of what came to be known as cell theory .
 Robert Remak, Rudolf Virchow
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:
 Robert Remak, Rudolf Virchow