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: The aim of this study was to examine further the renal function , including morphological analysis of the kidneys of male Sprague - Dawley rats treated with either cyclosporine A ( CsA ) , tacrolimus ( FK506 ) or SRL as monotherapies or in different combinations .
### Output Text:
The aim of this study was to examine further the renal function , including morphological analysis of the kidneys of male Sprague - Dawley rats treated with either <span class="chemical">cyclosporine A</span> ( <span class="chemical">CsA</span> ) , <span class="chemical">tacrolimus</span> ( <span class="chemical">FK506</span> ) or <span class="chemical">SRL</span> as monotherapies or in different combinations . 