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: Phenotypic and genotypic overlap between atelosteogenesis type 2 and diastrophic dysplasia .
### Output Text:
Phenotypic and genotypic overlap between <span class="disease">atelosteogenesis type 2</span> and <span class="disease">diastrophic dysplasia</span> . 