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: CONCLUSIONS : In CYP - induced cystitis , the expression of P2X3 and NK1 receptors increased in urothelium and / or suburothelium .
### Output Text:
CONCLUSIONS : In <span class="chemical">CYP</span> - induced cystitis , the expression of P2X3 and NK1 receptors increased in urothelium and / or suburothelium . 