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 revealed that the lack of cannabinoid CB1 receptors increased the severity of motor impairment and DA lesion , and reduced L - DOPA - induced dyskinesias .
### Output Text:
The results revealed that the lack of cannabinoid CB1 receptors increased the severity of motor impairment and <span class="chemical">DA</span> lesion , and reduced <span class="chemical">L - DOPA</span> - induced dyskinesias . 