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: Mutations in the diastrophic dysplasia sulfate transporter gene DTDST have been associated with a family of chondrodysplasias that comprises , in order of increasing severity , diastrophic dysplasia ( DTD ) , atelosteogenesis type 2 ( AO2 ) , and achondrogenesis type 1B ( ACG1B ) .
### Output Text:
Mutations in the <span class="disease">diastrophic dysplasia</span> sulfate transporter gene DTDST have been associated with a family of <span class="disease">chondrodysplasias</span> that comprises , in order of increasing severity , <span class="disease">diastrophic dysplasia</span> ( <span class="disease">DTD</span> ) , <span class="disease">atelosteogenesis type 2</span> ( <span class="disease">AO2</span> ) , and <span class="disease">achondrogenesis type 1B</span> ( <span class="disease">ACG1B</span> ) . 