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: By 1 year , these mice have no behavioral abnormalities and morphometric analysis at 6 ( one animal ) and 9 ( two animals ) months age revealed no changes .
### Output Text:
By 1 year , these mice have no <span class="disease">behavioral abnormalities</span> and morphometric analysis at 6 ( one animal ) and 9 ( two animals ) months age revealed no changes . 