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Composite interval map for critical photoperiod. (Top) Likelihood ratios. (Bottom) The corresponding R2 for each of the nine QTL. Digenic epistatic interactions between markers are shown as brackets subtended by a dashed line in the top graph. For clarity, individual markers from Figure 1 are shown only if they are mentioned in the results and discussion. For the gene-based markers, both homozygotes and the heterozygote were distinguishable.
