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Key developmental stages of spine base expansion in cucumber fruits. Digital camera images (A), SEM images (B) and paraffin sections (C) of cucumber spine before base expansion (left, fruit length around 0.5cm), during base expansion (middle, fruit length around 1.0cm), and after rapid base expansion (right, fruit length around 1.6cm). Bars, 200 µm (B, C).). (This figure is available in colour at JXB online.)
