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In chicken embryo , differentiating endothelial cells in the ventral part of blood islands express CCN3 from the initial stage ( Fig . 1e ) .
 embryo, endothelial cells, ventral part, blood islands
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
 embryo, endothelial cells, ventral part, blood islands