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: By day 45 - 126 , at a time when glomerular scarring was present , GLEPP1 was absent from glomerulosclerotic areas although the total glomerular content of GLEPP1 was not different from normal .
### Output Text:
By day 45 - 126 , at a time when glomerular scarring was present , GLEPP1 was absent from glomerulosclerotic areas although the total glomerular content of GLEPP1 was not different from normal . 