X-Message-Number: 22453
From: "David Pizer" <>
Subject: question
Date: Wed, 3 Sep 2003 05:13:13 -0700

I am working on a philosophy paper about legal issues in freezing and storing 
tissue.  The briefs state that frozen pre-embryos (zygote divided up to 8 cells)
can be held in liquid nitrogen for 2 years and up to 10 years and still be 
considered ok for implantation.

Does anyone know why they can't be implanted after 20 years or 50 years or 100 
years.  At liquid nitrogen temperature I would think it wouldn't matter how long
they were stored?  Is there any evidence to support this?

Thanks for any help


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