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: Together , these results demonstrate that CTG - repeat expansions can suppress local gene expression and implicate DMAHP in DM pathogenesis .
### Output Text:
Together , these results demonstrate that CTG - repeat expansions can suppress local gene expression and implicate DMAHP in <span class="disease">DM</span> pathogenesis . 