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Principal component analysis of genotyping data. A) Clustering of winter and spring wheat lines; B) Clustering of pre-defined breeding populations; sCA, sCM, sID, sWA, sWB, sMN, sMT and sSD - spring wheat populations; wMT, wNE, wSD, wKS, wNY, sCO, wOK, wTX and wWB - winter wheat populations.
