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: Native kidney specimens included a wide range of glomerulopathies as well as cases of thrombotic microangiopathy , malignant hypertension , acute interstitial nephritis , and acute tubular necrosis .
### Output Text:
Native kidney specimens included a wide range of glomerulopathies as well as cases of thrombotic microangiopathy , malignant hypertension , acute interstitial nephritis , and acute tubular necrosis . 