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Fig. 6. EGFR contributes to HB-EGF-dependent eyelid closure process. (A,B) Neonatal
eyelid of a wild-type (A) and a double mutant mouse carrying the HB-EGF null
allele and the waved 2 EGFR allele, showing an EOB phenotype (B). (C)
Penetrance of the EOB phenotype in compound mutants carrying the HB-EGF null
(`d') and waved 2 (`wa2') alleles. Blue bars indicate pups with normal closed
eyes; red bars indicate pups with EOB.