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: Hemolysis caused by TAM was not preceded by the leakage of K ( + ) from the cells , also excluding a colloid - osmotic type mechanism of hemolysis , according to the effects on osmotic fragility curves .
### Output Text:
Hemolysis caused by <span class="chemical">TAM</span> was not preceded by the leakage of <span class="chemical">K</span> ( + ) from the cells , also excluding a colloid - osmotic type mechanism of hemolysis , according to the effects on osmotic fragility curves . 