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 mice , apomorphine produced qualitatively different responses under novel conditions when compared to those behaviors elicited in the home test cage .
### Output Text:
In mice , <span class="chemical">apomorphine</span> produced qualitatively different responses under novel conditions when compared to those behaviors elicited in the home test cage . 