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: The results suggest that increased brain serotoninergic transmission with fluoxetine may reduce levodopa - or dopamine agonist - induced dyskinesias without aggravating parkinsonian motor disability .
### Output Text:
The results suggest that increased brain serotoninergic transmission with <span class="chemical">fluoxetine</span> may reduce <span class="chemical">levodopa</span> - or <span class="chemical">dopamine</span> agonist - induced dyskinesias without aggravating parkinsonian motor disability . 