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: GALT protein abundance was increased in LA compared to D alleles , but mRNA was similar among all genotypes .
### Output Text:
GALT protein abundance was increased in LA compared to D alleles , but mRNA was similar among all genotypes . 