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: One is in exon 5 ( nucleotide C566 - - > T ; Ser189 - - > Phe ) of the C2Q0 gene linked to the MHC haplotype A11 , B35 , DRw1 , BFS , C4A0B1 .
### Output Text:
One is in exon 5 ( nucleotide C566 - - > T ; Ser189 - - > Phe ) of the C2Q0 gene linked to the MHC haplotype A11 , B35 , DRw1 , BFS , C4A0B1 . 