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Fig. 1. Frequency distribution of F2:3 family means for rind penetrometer resistance. (A) Population 1 (MoSCSSS-High1 x MoSQB-Low)F2:3, (B) Population 2 (MoSCSSS-High2 x MoSCSSS-Low)F2:3, (C) Population 3 (MoSCSSS-High3 x Mo47)F2:3, and (D) Population 4 (B73 x Mo47)F2:3. All populations are displayed on a similar scale for comparison purposes.