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: Pseudoacromegaly , on the other hand , is the presence of similar acromegaloid features in the absence of elevated growth hormone or insulin - like growth factor levels .
### Output Text:
Pseudoacromegaly , on the other hand , is the presence of similar acromegaloid features in the absence of elevated growth hormone or insulin - like growth factor levels . 