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: Behavioral apomorphine - induced penile erections were reduced ( 5 / 8 ) and increased ( 3 / 8 ) in uni - and bilateral lesioned animals .
### Output Text:
Behavioral <span class="chemical">apomorphine</span> - induced penile erections were reduced ( 5 / 8 ) and increased ( 3 / 8 ) in uni - and bilateral lesioned animals . 