And divides anew every 12 to 15 hours.

But there are more important things that are already occurring embryo screening.

look like that, and then my embryoblast is going to look like this.

Since it's so pluripotent, it can become germ plasm.

So sometimes you'll say morula, and you go to blastula.

If this research is successful, it may then reduce the need to research and sacrifice human embryos.

But it doesn't have to just infect somatic cells, it could infect a germ cell.

The zygote happens or gets created and starts splitting up the morula, and then it keeps splitting and it differentiates into the blastocyst, and then this is where the stem cells are.

Let me write those words down.

So the debate obviously is when you start an embryonic stem cell line, you are destroying an embryo.

45 Days

A very non intuitive spelling of the coel part of blastocoel.

And this mass of cells, we can start calling it, this right here, this is referred to as the morula.

So eventually all of these turn into blastocysts.

This is an extremely new field.

Let me write this down in a vibrant color.

On delivery, 50,000 more for each viable embryo.

Beginning of the primitive vertebrae

So why should you care? Bone marrow is a very rich source of adult stem cells.

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Now, it can be a very confusing topic, because a lot of times in a lot of books on biology, you'll say, hey, you go from the morula to the blastula or the blastosphere stage.

While we're talking about mammals, especially the ones that are closely related to us, the stage is the blastocyst stage, and the real differentiator is when people talk about just blastula and blastospheres.

All vertebrate embryos are inherently female, anyway.

So at least my take on it is if you're against and I generally don't want to take a side on this, but if you are against research that involves embryonic stem cells because of the destruction of embryos, on that same, I guess, philosophical ground, you should also be against in vitro fertilization because both of these involve the destruction of zygotes.

But adult stem cells are not embryonic stem cells.

Fertilization.

That's 1.5 million if you get all 15 species off the island. I'll get them all. Remember, viable embryos.

So these all become zygotes, and then they allow them to develop, and they usually allow them to develop to the blastocyst stage.

Let me scroll down a little bit.

So that's what they call a stem cell line.

And then again.

The inner cells pick a suitable color.

Birds have basically rudimentary tails.

The whole process of differentiation is actually fascinating, and we'll talk a lot more about that when we talk about stem cells, embryonic stem cells, and maybe we'll even talk about the debate of it.

It's got germ.

So he'll take, say, falcon skin cells, fibroblast, turn it into induced pluripotent stem cells.

They have a blastocoel in the center, which is this area of fluid.

There isn't necessarily this differentiation between these outermost cells and these embryonic, or this embryoblast, or this inner cell mass here.

And the debate all revolves around the issue of if you were to go in here and try to extract one of these cells, you're going to kill this embryo.

Mitosis is the mechanism, so now my trophoblast is going to

And then you have this space that forms here, and this is just fluid, and it's called the blastocoel.

And at that time, stem cell research had gained momentum, following the isolation of the world's first human embryonic stem cells in the 1990s.

looking at small clusters of the body, these little pieces of tissue that were the trophoblasts coming off of the blastocyst, all of a sudden burrowing itself into the side of the uterus, saying, I'm here to stay.

And so, just so you know a couple of the labels that are involved here, if we're dealing with a mammalian organism, and we are mammals, we call this thing that the morula turned into is a zygote, then a morula, then the cells of the morula started to differentiate into the trophoblast, or kind of the outside cells, and then the embryoblast.

For men, that's sperm and for women it's eggs.