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Scientific Activity De Robertis carried out his postdoctoral training ( 1974 – 1977 ) with Sir John Gurdon , the distinguished developmental biologist , at the Medical Research Council in the United Kingdom .
 person: De Robertis; person: Gurdon
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: De Robertis; person: Gurdon