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John Newport Langley and Paul Ehrlich introduced the concept of a receptor that would mediate drug action at the beginning of the 20th century .
 John Newport Langley, Paul Ehrlich
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:
 John Newport Langley, Paul Ehrlich