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 summary , the chick embryo provides a reliable and simple experimental animal model of coniine - induced arthrogryposis .
### Output Text:
In summary , the chick embryo provides a reliable and simple experimental animal model of <span class="chemical">coniine</span> - induced arthrogryposis . 