X-Message-Number: 3191
Newsgroups: sci.cryonics
From:   (James Golczewski)
Subject: Re: Hayflick
Message-ID: <>
References: <>
Date: Wed, 28 Sep 1994 15:27:06 GMT

 writes:
>                                     LIMITED HAYFLICK
>BOOK REVIEW: How and Why We Age, Leonard Hayflick, Ballantine 1994, hard
>(The author, a professor of anatomy and a gerontologist, discovered the
>"Hayflick limit"--referring to the
>fact that, in vitro, cultured cells of most kinds do not divide and multiply
>indefinitely, but die
>off after a certain number of generations; i.e., that death is usually
>programmed even at the
>cellular level.)
   Normal cells like fibroblasts divide only a limited number of times
in vitro; transformed, or cancer cells generally are immortal.
Hayflick's discovery of this was certainly very interesting and
important, but it has never been established that this phenomenon has
anything at all to do with aging of the animal as a whole. 
 

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