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: Fluorescence in situ hybridization and linkage analysis located the Atm gene on mouse chromosome 9 , band 9C , in a region homologous to the ATM region on human chromosome 11q22 - q23 . .
### Output Text:
Fluorescence in situ hybridization and linkage analysis located the Atm gene on mouse chromosome 9 , band 9C , in a region homologous to the ATM region on human chromosome 11q22 - q23 . . 