10588
Microprobe X - ray fluorescence of tumor thin sections showed the strong penetration of ruthenium into the tumor tissue , with the highest concentrations near blood vessels and in the edge regions of the tissue samples .
 Chemical: ruthenium
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: ruthenium 
Answer:
 Chemical: ruthenium