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: Results show that cumulative HAART caused mitochondrial CM with elevated LA in AIDS transgenic mice .
### Output Text:
Results show that cumulative HAART caused mitochondrial CM with elevated <span class="chemical">LA</span> in AIDS transgenic mice . 