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 streptozotocin - induced hyperalgesia , inducible NO synthase participates in pronociceptive activity of bradykinin , whereas in vincristine - induced hyperalgesia bradykinin seemed to activate neuronal NO synthase pathway .
### Output Text:
In <span class="chemical">streptozotocin</span> - induced hyperalgesia , inducible <span class="chemical">NO</span> synthase participates in pronociceptive activity of <span class="chemical">bradykinin</span> , whereas in <span class="chemical">vincristine</span> - induced hyperalgesia <span class="chemical">bradykinin</span> seemed to activate neuronal <span class="chemical">NO</span> synthase pathway . 