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: METHODS : For a period of 2 weeks , CsA 15 mg / kg / day ( given orally ) , FK506 3 . 0 mg / kg / day ( given orally ) or SRL 0 . 4 mg / kg / day ( given intraperitoneally ) was administered once a day as these doses have earlier been found to achieve a significant immunosuppressive effect in Sprague - Dawley rats .
### Output Text:
METHODS : For a period of 2 weeks , <span class="chemical">CsA</span> 15 mg / kg / day ( given orally ) , <span class="chemical">FK506</span> 3 . 0 mg / kg / day ( given orally ) or <span class="chemical">SRL</span> 0 . 4 mg / kg / day ( given intraperitoneally ) was administered once a day as these doses have earlier been found to achieve a significant immunosuppressive effect in Sprague - Dawley rats . 