Fig. 4From: Contrasting genetic variation and positive selection followed the divergence of NBS-encoding genes in Asian and European pearsSynteny analysis of the NBS-encoding genes between P. bretschneideri and P. communis. Letter ‘ch’ means the chromosome of P. bretschneideri and letter ‘eu’ means the chromosome of P. communis. Brown lines means collinearity relationships among genes between P. bretschneideri and P. communisBack to article page