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: This mutation has not been found so far in 8 analyzed ACG1B patients , suggesting that it allows some residual activity of the sulfate transporter . .
### Output Text:
This mutation has not been found so far in 8 analyzed <span class="disease">ACG1B</span> patients , suggesting that it allows some residual activity of the sulfate transporter . . 