And these technologies were very promising, but the problem was that they were either inefficient, or they were difficult enough to use that most scientists had not adopted them for use in their own laboratories, or certainly for many clinical applications.
Y estas tecnologías  eran muy prometedoras, pero el problema resultaba  que eran tan ineficaces, o tan difíciles de usar que muchos científicos no aprobaban  su uso en sus propios laboratorios, o así también su uso en  muchos aplicaciones clínicas.