13616
Moreover , the CXCL12 / CXCR4 / CXCR7 system appears to be directly involved in microvessel growth , its members being differentially expressed in angiogenically activated microvessels and vascular sprouts .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None