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Oswald Avery was born in Canada
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Erwin Chargaff was born in Ukraine.
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Francis Crick was born in Weston Favell, United Kingdom.
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Rosalind Franklin was born in London
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Oswald is known for his expiriment which isolated DNA as the material of which genes and chromosomes are made.
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Erwin Chargaff is known for analyzing the base composition (a=t and g=c) which, later also helped Watson and Crcik discover the Double Helix structure.
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James Watson and Francis Crick discoever the structure of the DNA. The structure was the Double Helix. They found this out with the help of Rosalind Franklins X-ray images of DNA.
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Rosalind Franklin helped find the structure of the Double Helix but did not get as much credit as James Watson and Francis Crick.