57964
Stromal cell-derived factor 1 ( SDF-1 ) and CXCR4 mediate recruitment of mesenchymal stem cells .
 location: CXCR4
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: CXCR4 
Answer:
 location: CXCR4