In the sentence extracted from biomedical literature, identify all the chemical entities. The required answer format is the same sentence with HTML <span> tags to mark up specific entities. 
### Entity Markup Guides:
Use <span class="chemical"> to denote a chemical.

### Input Text: Testosterone - dependent hypertension and upregulation of intrarenal angiotensinogen in Dahl salt - sensitive rats .
### Output Text:
<span class="chemical">Testosterone</span> - dependent hypertension and upregulation of intrarenal angiotensinogen in Dahl <span class="chemical">salt</span> - sensitive rats . 