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: Immunohistochemical study on inducible type of nitric oxide ( iNOS ) , basic fibroblast growth factor ( bFGF ) and tumor growth factor - beta1 ( TGF - beta1 ) in arteritis induced in rats by fenoldopam and theophylline , vasodilators .
### Output Text:
Immunohistochemical study on inducible type of <span class="chemical">nitric oxide</span> ( iNOS ) , basic fibroblast growth factor ( bFGF ) and tumor growth factor - beta1 ( TGF - beta1 ) in arteritis induced in rats by <span class="chemical">fenoldopam</span> and <span class="chemical">theophylline</span> , vasodilators . 