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: In rats , detection of apomorphine - induced hyperactivity was facilitated by a period of acclimatization to the test conditions .
### Output Text:
In rats , detection of <span class="chemical">apomorphine</span> - induced hyperactivity was facilitated by a period of acclimatization to the test conditions . 