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: Proteomic analysis of striatal proteins in the rat model of L - DOPA - induced dyskinesia .
### Output Text:
Proteomic analysis of striatal proteins in the rat model of <span class="chemical">L - DOPA</span> - induced dyskinesia . 