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				| 1. | DiGeorge's syndrome is characterized by the lack of a thymus The mouse model closest to this human disease would be a | 
| A. | knock-out mouse for RAG-1 and RAG-2 | 
| B. | knock-out mouse for a thymus | 
| C. | nude mouse | 
| D. | recombinant mouse for CD3 | 
| Answer» D. recombinant mouse for CD3 | |