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The separation method for which Porath is most well known is gel filtration , which he developed together with Per Flodin .
 person: Porath
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Porath 
Answer:
 person: Porath