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Neighbor-joining phylogenic tree based on the genome sequences of 3 zebra-borne EHV-1 (T-616: KF644573; T-529: KF644580; 94-137: KF644575), 2 horse strains of EHV-1 (Ab4p:AY665713; V592:AY464052) [16, 17], EHV-8 (JQ343919) [14], EHV-9 (AP010838) [5] and EHV-4 (AF030027) [19]. All node has 100% bootstrap value. The tree was constructed by SplitsTree [9]. The scale bar is given by average number of mutations per site.
