2508
In this study , we have investigated gene knockdown analysis of endothelial Robos , in particular roundabout 4 ( robo4 ) , the predominant Robo in endothelial cells using small interfering RNA technology in vitro .
 Anatomy: endothelial; 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; Anatomy: endothelial cells