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 , 103C - - > T , results in a stop codon at position 35 of the ATM protein .
### Output Text:
This mutation , 103C - - > T , results in a stop codon at position 35 of the ATM protein . 