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 most people with red - blood - cell glucose - 6 - phosphate dehydrogenase ( G6PD ) deficiency , the enzyme - deficient phenotype is only moderately expressed in nucleated cells .
### Output Text:
In most people with red - blood - cell <span class="disease">glucose - 6 - phosphate dehydrogenase ( G6PD ) deficiency</span> , the enzyme - deficient phenotype is only moderately expressed in nucleated cells . 