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We have previously identified , by screening a lambda gt11 expression library , murine protein mXBP , which binds to a sequence which overlaps the 3 ' end of the murine class II major histocompatibility complex A alpha gene X box , a conserved transcription element found upstream of all class II genes .
 GENE: murine protein mXBP; GENE: murine class II major histocompatibility complex A alpha gene X box
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: murine protein mXBP; GENE: murine class II major histocompatibility complex A alpha gene X box