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: This corresponds well to the previous assignment of the locus for the human alkaptonuria gene ( AKU ) to the same chromosomal region by multipoint linkage analysis .
### Output Text:
This corresponds well to the previous assignment of the locus for the human <span class="disease">alkaptonuria</span> gene ( AKU ) to the same chromosomal region by multipoint linkage analysis . 