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To characterize the regulatory elements and potential transcription factors necessary for human PDX - 1 gene expression in beta - cells , we constructed a series of 5 ' and 3 ' deletion fragments of the 5 ' - flanking region of the gene , fused to the luciferase reporter gene .
 Anatomy: beta - cells
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Anatomy 
Text: {0} 
Answer:
 Anatomy: beta - cells