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: Similar to rats , systemic pilocarpine injection causes status epilepticus ( SE ) and the eventual development of spontaneous seizures and mossy fiber sprouting in C57BL / 6 and CD1 mice , but the physiological correlates of these events have not been identified in mice .
### Output Text:
Similar to rats , systemic <span class="chemical">pilocarpine</span> injection causes status epilepticus ( SE ) and the eventual development of spontaneous seizures and mossy fiber sprouting in C57BL / 6 and CD1 mice , but the physiological correlates of these events have not been identified in mice . 