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: There were no infectious deaths in renal transplant patients on cyclosporine or Aza , but infection played a major role in 3 out of 6 cardiac transplant deaths and in 8 out of 9 liver transplant deaths .
### Output Text:
There were no infectious deaths in renal transplant patients on <span class="chemical">cyclosporine</span> or <span class="chemical">Aza</span> , but infection played a major role in 3 out of 6 cardiac transplant deaths and in 8 out of 9 liver transplant deaths . 