Translate to French:

With the new protein, organs could be safely stored at below the freezing point, preserving them for longer periods of time.

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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La nouvelle protéine pourrait permettre de conserver les organes en toute sécurité au-dessous du point de congélation, et ainsi de les conserver plus longtemps.