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 aim of the current study was to determine the effects of NO on the behavioral and EEG characteristics of lindane - induced epilepsy in male Wistar albino rats .
### Output Text:
The aim of the current study was to determine the effects of <span class="chemical">NO</span> on the behavioral and EEG characteristics of <span class="chemical">lindane</span> - induced epilepsy in male Wistar albino rats . 