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: All of these positive GABA ( A ) modulators suppressed the expression of kindled seizures , whereas only allopregnanolone and ganaxolone inhibited the development of kindling .
### Output Text:
All of these positive <span class="chemical">GABA</span> ( A ) modulators suppressed the expression of kindled seizures , whereas only <span class="chemical">allopregnanolone</span> and <span class="chemical">ganaxolone</span> inhibited the development of kindling . 