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Longitudinal and cross-section images of shells of the wild almond species P. webbii (#63 in Table 1 and Figure 1), the thin “paper”-shelled California “Mission” variety (#19), their interspecies hybrid, and the interspecies introgression selection UCD2-240 (#54) along with a shell cross-section of the Spanish variety “Marcona” for comparison (#25 in Table 1 and Figure 1).
