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: Histologic examination of the renal tissue showed evidence of intravascular coagulation , primarily affecting the small arteries , arterioles , and glomeruli .
### Output Text:
Histologic examination of the renal tissue showed evidence of intravascular coagulation , primarily affecting the small arteries , arterioles , and glomeruli . 