2920
Recently , we have demonstrated that mouse microglial cells , the brain macrophages , express both IL - 15 and IL - 15 / IL - 2 receptors .
 GENE: IL - 15; GENE: IL - 15 / IL - 2 receptors
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: IL - 15; GENE: IL - 15 / IL - 2 receptors