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Ventral part of the endothelial precursor cells in blood islands is positive for CCN3 expression .
 Ventral part, endothelial precursor cells, blood islands
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
 Ventral part, endothelial precursor cells, blood islands