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: We believe that these findings could not only confound BRCA1 mutation analysis , but could have implications for the normal and abnormal regulation of BRCA1 transcription , translation and function . .
### Output Text:
We believe that these findings could not only confound BRCA1 mutation analysis , but could have implications for the normal and abnormal regulation of BRCA1 transcription , translation and function . . 