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: Arteritis induced in rats by vasodilators , fenoldopam and theophylline , was examined immunohistochemically for expressions of inducible type of nitric oxide synthase ( iNOS ) , basic fibroblast growth factor ( bFGF ) and tumor growth factor - beta1 ( TGF - beta1 ) .
### Output Text:
Arteritis induced in rats by vasodilators , <span class="chemical">fenoldopam</span> and <span class="chemical">theophylline</span> , was examined immunohistochemically for expressions of inducible type of <span class="chemical">nitric oxide</span> synthase ( iNOS ) , basic fibroblast growth factor ( bFGF ) and tumor growth factor - beta1 ( TGF - beta1 ) . 