Bill,
I believe you are correct on the blastula and I also think "immortal cell
lines" are possible- but I am not 100% sure. Regius can I use a lifeline :-)
Charlie
At 02:12 PM 10/5/00 -0400, you wrote:
>Re: "Zygote"
>
>Camilla, you're really digging up my old embryology class! :-) I think
>the zygote is a special entity in that it consists of the merged sperm and
>egg before it begins to split into the cells that then form the blastula. I
>would think that the zygote could only exist as such until it starts
>dividing into the undifferentiated cells that make up the blastula. I guess
>I'm going to have to get to a library and find a text on embryology.
>
>In my days we didn't call it an embryo until the cells had differentiated
>and migrated into their relative positions..... i.e. the "tadpole" stage...
>
>
>Whatdya think?
>
>Bill
>
>*****************************
>
>-----Original Message-----
>From: Camilla Flintermann [mailto:[log in to unmask]]
>Sent: Thursday, October 05, 2000 11:22 AM
>To: [log in to unmask]
>Subject: Re: Stem Cells = "Blastula" ?
>
>
>Well, my embryology class was a looooong time ago---and you may be right,
>but the stage I have seen cited is the zygote, a "cell produced by the
>union of egg and spern":(acc. to Tabers' Medical Encyclopedia) which I
>think would be even earlier than a blastula? Is this correct?
>
>
>
>
> >Stem Cells = "Blastula" ?
> >
> >Is it not true that the best undifferentiated cells are to be found in the
> >blastula phase of development?
> >
> >If I remember my college embryology from 35 years ago, (and if they haven't
> >completely changed the field of embryology since then), the egg and sperm
> >come together, begin to split and form a hollow sphere made up of cells....
> >a blastula. At this stage the individuals cells can become anything,
> >depending on chemical and other conditions and influences ("tropisms") to
> >which they may become exposed.
> >
> >If the blastula is the best source of stem cells, then should the questions
> >not be focused on the use of blastulas, not embryos. What say you?
> >
> >Bill
> >PWP, New Jersey
>
>
>Camilla Flintermann, CG for Peter 82/70/55
>Oxford, Ohio
> <[log in to unmask]>
>
> on PDWebring at
>http://members.tripod.lycos.nl/genugten/flinterm.htm
>
> "Ask me about the CARE list for
> Caregivers of Parkinsonians ! "
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Charles T. Meyer, M.D.
Middleton, WI
PD DX 12 years (at age 44)
Age 56
