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: Moreover , mitotic instability analysis of different human DM tissues shows length mosaicism between different cell lineages .
### Output Text:
Moreover , mitotic instability analysis of different human <span class="disease">DM</span> tissues shows length mosaicism between different cell lineages . 