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: The present studies examine the expression and regulation of another receptor known to bind NGF , p75 ( NTR ) , after various durations of bladder inflammation induced by cyclophosphamide ( CYP ) .
### Output Text:
The present studies examine the expression and regulation of another receptor known to bind NGF , p75 ( NTR ) , after various durations of bladder inflammation induced by <span class="chemical">cyclophosphamide</span> ( <span class="chemical">CYP</span> ) . 