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: We conclude that cortisol - induced increases in blood pressure are not associated with abnormalities in the l - arginine transport system .
### Output Text:
We conclude that <span class="chemical">cortisol</span> - induced increases in blood pressure are not associated with abnormalities in the <span class="chemical">l - arginine</span> transport system . 