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Eyelid open phenotype. a. Haematoxylin-eosin stained coronal sections through the eyes of E15.5 (before fusion) and E16 (after fusion) in wild-type (WT) and homozygote (Jf/Jf) embryos. Scale bars 200 μm. b. Failure of eyelids closure in a homozygote mouse (Jf/Jf) at birth (arrow).
