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 dyskinesias were reduced predominantly in the lower limbs during the onset and disappearance of dystonic dyskinesias ( onset - and end - of - dose dyskinesias ) and in the upper limbs during choreic mid - dose dyskinesias .
### Output Text:
The dyskinesias were reduced predominantly in the lower limbs during the onset and disappearance of dystonic dyskinesias ( onset - and end - of - dose dyskinesias ) and in the upper limbs during choreic mid - dose dyskinesias . 