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: The hybrid PAX3 - FKHR fusion protein of alveolar rhabdomyosarcoma transforms fibroblasts in culture .
### Output Text:
The hybrid PAX3 - FKHR fusion protein of <span class="disease">alveolar rhabdomyosarcoma</span> transforms fibroblasts in culture . 