There are multiple definitions:

1. electron transport system(English)

   • Physiology

2. environmental tobacco smoke(English)

   • PDE4i, AAT, ABT, BVR, COPD, CPPS, ETS, ICS, LABA, LVRS, NCC, NIV
   • Environment, Safety and health
   • https://doi.org…507/bp.2013.039

3. E-twenty-six(English)

   • family of transcription factors
   • EWSR1
   • Transcription
   • https://doi.org…6/NEJMra2028910

4. ethosuximide(English)

   • refers to effect of sildenafil on activity on this antiepileptic drug
   • CZP, TGB, AED, CBZ, GBP, LC-MS, LEV, MES, MEST, NO, NOS, OXC, PB, PDE, PHT, PKG, PTZ, TPM, VGB, VPA
   • Epilepsy or syncope
   • https://doi.org…pbp.2013.08.009