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Angiogenesis was studied with factor 8 - related antigen ( F8 - RA ) which identifies endothelial cells .
 Anatomy: endothelial cells
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Anatomy 
Text: {0} 
Answer:
 Anatomy: endothelial cells