In the sentence extracted from biomedical literature, identify all the disease entities. The required answer format is the same sentence with HTML <span> tags to mark up specific entities. 
### Entity Markup Guides:
Use <span class="disease"> to denote a disease.

### Input Text: To elucidate the role of DMPK in DM pathogenesis we have developed Dmpk deficient ( Dmpk - / - ) mice .
### Output Text:
To elucidate the role of DMPK in <span class="disease">DM</span> pathogenesis we have developed <span class="disease">Dmpk deficient</span> ( Dmpk - / - ) mice . 