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: SSCP analysis of individually amplified exons , with which nine of the 10 mutations were seen , was the most useful detection method for PAX6 . .
### Output Text:
SSCP analysis of individually amplified exons , with which nine of the 10 mutations were seen , was the most useful detection method for PAX6 . . 