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 mouse homolog of the Wiskott - Aldrich syndrome protein ( WASP ) gene is highly conserved and maps near the scurfy ( sf ) mutation on the X chromosome .
### Output Text:
The mouse homolog of the <span class="disease">Wiskott - Aldrich syndrome</span> protein ( WASP ) gene is highly conserved and maps near the scurfy ( sf ) mutation on the X chromosome . 