reprogramasen
Imperfect subjunctive ellos/ellas/ustedes conjugation of reprogramar.

reprogramar

Habían logrado que las células de un ratón se reprogramasen, es decir, volvieran a un estadio similar al embrionario.
They had managed to reprogramme the cells of a living mouse, i.e. to return them to a stadium similar to the embryonic state.
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