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Genetic relatedness of 192 perennial ryegrass accessions with 109 simple sequence repeats (SSRs) as analysed by the STRUCTURE program. Numbers on the y-axis indicate the membership coefficient. The colour of the bar indicates the five groups identified through the STRUCTURE program (G1=red, G2=green, G3=blue, G4=yellow, and G5=pink). Accessions with the same colour belong to the same group.
