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: ATM - / - fibroblasts are inefficient in G1 to S - phase progression following serum stimulation and senesce after only a few passages in culture .
### Output Text:
ATM - / - fibroblasts are inefficient in G1 to S - phase progression following serum stimulation and senesce after only a few passages in culture . 