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 study was undertaken to investigate the effects of TET and FAN on the experimental thrombosis induced by collagen plus epinephrine ( EP ) in mice , and platelet aggregation and blood coagulation in vitro .
### Output Text:
The present study was undertaken to investigate the effects of <span class="chemical">TET</span> and <span class="chemical">FAN</span> on the experimental thrombosis induced by collagen plus <span class="chemical">epinephrine</span> ( <span class="chemical">EP</span> ) in mice , and platelet aggregation and blood coagulation in vitro . 