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: CONCLUSIONS : Our current finding that animals in the CHX + Pilo group have a GAP43 - ir band in the IML , similar to that of controls , reinforces prior data on the blockade of MFS in these animals .
### Output Text:
CONCLUSIONS : Our current finding that animals in the <span class="chemical">CHX</span> + <span class="chemical">Pilo</span> group have a GAP43 - ir band in the IML , similar to that of controls , reinforces prior data on the blockade of MFS in these animals . 