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: A unique sequence human Rb1 cosmid DNA probe has been used to localize this region on apes Chr 14 by the FISH technique .
### Output Text:
A unique sequence human Rb1 cosmid DNA probe has been used to localize this region on apes Chr 14 by the FISH technique . 