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Microscopic images of (A) oil ejection from oil gland reservoir through the flavedo, (B) a cross-sectional view of a singular oil gland with boundary layer membrane partially intact, (C) a group of unbroken oil glands subjected to external bending, and (D) a cross-sectional view of an oil gland after rupture. The gland in D appears slightly collapsed due to ingress of the albedo toward the flavedo during rupture.
