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: In electron micrographs both luminal and antiluminal sides of the BBB of the cerebellar cortex had similar lesions .
### Output Text:
In electron micrographs both <span class="chemical">luminal</span> and antiluminal sides of the BBB of the cerebellar cortex had similar lesions . 