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The deletion of an extra six nucleotides in the 5′ -untranslated region of the nucleoprotein gene of Newcastle disease virus NA-1 decreases virulence

Crossref DOI link: https://doi.org/10.1186/s12917-014-0305-5

Published Online: 2014-12-21

Published Print: 2014-12

Update policy: https://doi.org/10.1007/springer_crossmark_policy

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