Four-cell animal embryo
E.C. Raff and R.A. Raff
This early-stage embryo is protected by a fertilization envelope, seen here as a white line encircling the embryo cells.2008E.C. Raff and R.A. RaffFour-cell animal embryo
Created: 2008
Copyright Holder: E.C. Raff and R.A. Raff
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