[castis]

We are not. These are embryo-like structures. Not actual human embryos.

[exe34]

they have no mouth even if they want to scream.

[jdonaldson]

I'm an organ donor, and I have no problem giving my organs away after I'm quite positive I won't feel it. I think as long as there is no sensation, there is no pain, and certainly no formal concept of "self". But still, with matters of exploitation of our bodies, we should tread very very lightly.