Some think they are, some dont. According to classical philosophers, an entity can only be defined by what it is to become, so therefore embryos are human.
As part of my dissertation, I am analysing peoples ideas with regards to this, and I am desperately in need of volunteers to fill in a QUICK questionnaire about this. So, if you can very kindly spare a couple of minutes of your precious lives, please email me on stem.cells07@googlemail.com and I will send you a copy to fill out.
I thank all you kind folks in advanced (do i sound patronising?? not intended : ))