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: Although VE had a similar decrease in both groups , in the epileptic group , the decrease in VE was due to a significant ( p < 0 . 05 ) increase in TE peak in relation to that of the control animals .
### Output Text:
Although VE had a similar decrease in both groups , in the epileptic group , the decrease in VE was due to a significant ( p < 0 . 05 ) increase in TE peak in relation to that of the control animals . 