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Dear Mary, Medically speaking, an embryo is the stage in prenatal development between the 2nd and 8th week. A fetus is the stage of development from the 3rd to 9th month. FYI, the stage before embryo is called zygote. Bonnie Cunningham, R.N. NPF Date: Tue, 27 Oct 1998 12:34:50 EST From: [log in to unmask] Subject: Embryo/Fetus/q Hi, List members.all ! I'm wondering how Congresspeople are interpreting the difference between "fetus" and "embryo" with respect to Parkinson's or any other research. Would someone, either medical or Congressional, define the difference, please? (professionally,that is.) We'd all be grateful. Thank you. [log in to unmask] (Mary Manfredi)