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: Truncated ATM protein was not detected in lymphoblasts from ataxia - telangiectasia patients homozygous for mutations leading to premature protein termination .
### Output Text:
Truncated ATM protein was not detected in lymphoblasts from <span class="disease">ataxia - telangiectasia</span> patients homozygous for mutations leading to premature protein termination . 