4225
As a test of this hypothesis , we predicted that mice which have altered expression of class I gene products , the beta2 - microglobulin knockout mice , [ beta2m ( - / - ) ] , would develop Fe overload .
 GENE: beta2 - microglobulin; GENE: [ beta2m ( - / - ) ]
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: beta2 - microglobulin; GENE: [ beta2m ( - / - ) ]