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 Wiskott - Aldrich syndrome protein ( WASP ) gene was found to be mutated in patients presenting with WAS and in patients showing X - linked thrombocytopenia .
### Output Text:
The <span class="disease">Wiskott - Aldrich syndrome</span> protein ( WASP ) gene was found to be mutated in patients presenting with <span class="disease">WAS</span> and in patients showing <span class="disease">X - linked thrombocytopenia</span> . 