The reason religion is so powerful

[Peebothuhlu]

At work.

Neo's reasoning was that the embryo is biologically human from conception. Any undamaged human cell is biologically human. Being biologically human doesn't make something a human being.

Right; he is using human as a noun—the embryo is a human being from conception. You're referring to human as an adjective—human hair.

Here's a word I learned from vulcanlogician: totipotency. It's the power of a cell to produce an entirely new organism.

So human genetics + totipotency + any other relevant factor = New Human (noun) organism.

Human zygotes meet this criteria. But without the cells in your cheeks achieving totipotency, for example, we cannot compare them to zygotes or call them human beings. Once they do that's another story.

Just sticking an oar into the pond.

Not quite sure how relevant the information is BUT folks are aware of tumours being removed that had started to create differentiated cells?

As in a tumour that was also growing teeth (Possibly tooth) within its mass?

I know there's a proper medical term for that kind of weirdness but my limited Googlefoo isn't comming up with it atm.

All the DNA of the person is still within the cancer. It's just the workings of those cells that are out of kilter.

Jus' sayin'.

Cheers.