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Naturally occurring prunus mutant phenotype. (A) Transverse section of a wild-type plum (left) and “Stoneless” (right). The endocarp is visible as a whitish tissue layer surrounding the seed. In “Stoneless” a cavity is visible where endocarp tissue is normally found. (B) Same fruit stained with phloroglucinol-HCL to visualize lignin production (red color). Little or no lignin staining is found in “Stoneless.”
