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: alpha - TC and DFO attenuated the MA - induced hyperthermia as well as the alterations in the locomotor activity .
### Output Text:
<span class="chemical">alpha - TC</span> and <span class="chemical">DFO</span> attenuated the <span class="chemical">MA</span> - induced hyperthermia as well as the alterations in the locomotor activity . 