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: Highly active antiretroviral therapy ( HAART ) is implicated in cardiomyopathy ( CM ) and in elevated plasma lactate ( LA ) in AIDS through mechanisms of mitochondrial dysfunction .
### Output Text:
Highly active antiretroviral therapy ( HAART ) is implicated in cardiomyopathy ( CM ) and in elevated plasma <span class="chemical">lactate</span> ( <span class="chemical">LA</span> ) in AIDS through mechanisms of mitochondrial dysfunction . 