2415
Sensitivity of erythroid progenitor colonies to erythropoietin in azidothymidine treated immunodeficient mice .
 Chemical: azidothymidine; Disease: immunodeficient
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: azidothymidine; Disease: immunodeficient