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Alberts, Bruce; Johnson, Alexander; Lewis, Julian; Raff, Martin; Roberts, Keith; Walter, Peter (2002). "Fertilization". Archived from the original on 2017-05-14.
What is a cell?Archived 2006-01-18 at the Wayback Machine 2004. A Science Primer: A Basic Introduction to the Science Underlying NCBI Resources. NCBI; and Campbell, Neil A.; Reece, Jane B.; Biology Benjamin Cummings, Pearson Education 2002.