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: Dmpk - / - mice develop a late - onset , progressive skeletal myopathy that shares some pathological features with DM .
### Output Text:
Dmpk - / - mice develop a late - onset , <span class="disease">progressive skeletal myopathy</span> that shares some pathological features with <span class="disease">DM</span> . 