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: When LA / D and D / D GALT biochemical phenotypes were compared to N / N GALT phenotypes , both had 50 % , as compared to 21 % , reduction in GALT activity in the wild type ( N / N ) after exposure at identical initial enzyme activity to 50 degrees C for 15 min .
### Output Text:
When LA / D and D / D GALT biochemical phenotypes were compared to N / N GALT phenotypes , both had 50 % , as compared to 21 % , reduction in GALT activity in the wild type ( N / N ) after exposure at identical initial enzyme activity to 50 degrees C for 15 min . 