523
Atm - deficient mice are retarded in growth , do not produce mature sperm , and exhibit severe defects in T cell maturation while going on to develop thymomas .
 Disease: thymomas
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease 
Text: {0} 
Answer:
 Disease: thymomas