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. 1999 Jun 7;189(11):1839–1845. doi: 10.1084/jem.189.11.1839

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Electron microscopic analysis of livers from E13 Ikkβ^+/+, Ikkβ^+/−, and Ikkβ^−/− embryos. Both E13 Ikkβ^+/+ (A) and Ikkβ^+/− (B) livers exhibited normal morphology. The Ikkβ^−/− liver (C) exhibited varying degrees of apoptosis characterized by collapsed and condensed nuclei and general cellular degeneration. Bars = 5 μm.