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 cerebella of ATM - / - mice appear normal by histologic examination at 3 to 4 months and the mice have no gross behavioral abnormalities .
### Output Text:
The cerebella of ATM - / - mice appear normal by histologic examination at 3 to 4 months and the mice have no gross <span class="disease">behavioral abnormalities</span> . 