Translate the given Spanish text to English

[EX Q]: Therapeutic compositions which comprise at least one epitope are provided.
[EX A]: Se proporcionan composiciones terapeuticas que comprenden al menos un epitope.

[EX Q]: The earplug includes a stem.
[EX A]: El tapón auditivo incluye un rabillo.

[EX Q]: A poly(trimethylene-ethylene ether) glycol is disclosed.
[EX A]:
Se revela un glicol de poli(eter de trimetileno- etileno).