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. 2018 Aug 31;18:175. doi: 10.1186/s12870-018-1386-2

Fig. 6.

Fig. 6

Relatedness tree of 21 Pyrus sp. accessions performed with cladogram function based on neighbor-joining algorithm. VB normalized date is indicated in the color key, i.e., − 2 indicates early VB date and 2 indicates late VB date