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: However , apomorphine - induced reductions in striatal dopamine turnover were detected in both novel and home cage environments .
### Output Text:
However , <span class="chemical">apomorphine</span> - induced reductions in striatal <span class="chemical">dopamine</span> turnover were detected in both novel and home cage environments . 