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: After digestion with trypsin , peptides were separated by reversed phase chromatography and amino acid sequenced .
### Output Text:
After digestion with trypsin , peptides were separated by reversed phase chromatography and amino acid sequenced . 