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: The A305E missense mutation accounted for 48 % ( 24 / 50 ) of mutant chromosomes in patients of western European descent , while the two predominant Jewish mutations each accounted for a single mutant chromosome .
### Output Text:
The A305E missense mutation accounted for 48 % ( 24 / 50 ) of mutant chromosomes in patients of western European descent , while the two predominant Jewish mutations each accounted for a single mutant chromosome . 