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Various studies using the mouse , quail / chick , and frog have uncovered a number of signals that guide these complex processes but many gaps still exist in our understanding of the mechanisms by which the embryonic vasculature is built .
 Anatomy: embryonic vasculature
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: embryonic vasculature