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Cosegregation of NBSRps4/6 with the Rps4 locus. Solid arrows represent HindIII DNA fragments that cosegregate with the rps4 allele; shaded arrows represent HindIII fragments that cosegregate with Rps4, which are absent in all susceptible F2 plants. (*) HindIII fragments that segregate independently of the Rps4 locus.
