Changes

'''Embryonic stem cells''' are taken from a young embryo. They are generally taken from the inner cell mass of a [[blastocyst]].  They may also be derived from early blastomeres taken from a "morula", which is an embryo of 4 to 32 cells.  An embryo reaches the blastocyst stage about 4-5 days after [[fertilization]].  At that point they contain about 50-150 cells.  However, implantation (attaching to the uterine wall) does not occur until at least 9 days after fertilization.  Neurulation (primordial development of the central nervous system) occurs about a week later.<ref>http://9e.devbio.com/</ref>  '''''Embryonic stem cells are harmful to the recipient because they tend to grow tumors, and safer alternatives that do not use embryos are available, but many [[abortion]] supporters still insist on using embryonic stem cells in order to justify the concept of abortion'''''.

'''Embryonic stem cells''' are taken from a young embryo. They are generally taken from the inner cell mass of a [[blastocyst]].  They may also be derived from early blastomeres taken from a "morula", which is an embryo of 4 to 32 cells.  An embryo reaches the blastocyst stage about 4-5 days after [[fertilization]].  At that point they contain about 50-150 cells.  However, implantation (attaching to the uterine wall) does not occur until at least 9 days after fertilization.  Neurulation (primordial development of the central nervous system) occurs about a week later.<ref>http://9e.devbio.com/</ref>  '''''Embryonic stem cells are harmful to the recipient because they tend to grow tumors, and safer alternatives that do not use embryos are available, but many [[abortion]] supporters still insist on using embryonic stem cells in order to justify the concept of abortion'''''.