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Type 2 diabetes ( T2D ) disproportionally affects African Americans ( AfA ) but , to date , genetic variants identified from genome - wide association studies ( GWAS ) are primarily from European and Asian populations .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None