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. 2019 Oct 9;6:341. doi: 10.3389/fvets.2019.00341

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Copyright © 2019 Sultan, Ali, El Feil, Bazid, Zain El-Abideen and Kilany.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Full S1 gene sequence phylogeny of different vaccine seeds in relation to the available sequences on the GenBank. Vaccine seed strains are marked as 2 sets; middle eastern vaccine seeds (•) and imported vaccine seeds (■). Phylogenetic relationships through a bootstrap trial of 1,000 were determined with the MEGA version X using the Clustal W alignment algorithm and neighbor-joining method for tree construction.