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The phospholipid bilayer had already been proposed by Gorter and Grendel in 1925 , but the Davson – Danielli model 's flanking proteinaceous layers were novel and intended to explain Danielli 's observations on the surface tension of lipid bilayers .
 Davson, Danielli, Danielli
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Davson, Danielli, Danielli