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: In order to elucidate the cellular and molecular processes which are involved in Norrie disease ( ND ) , we have used gene targeting technology to generate ND mutant mice .
### Output Text:
In order to elucidate the cellular and molecular processes which are involved in <span class="disease">Norrie disease</span> ( <span class="disease">ND</span> ) , we have used gene targeting technology to generate <span class="disease">ND</span> mutant mice . 