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Cover Keratinocyte growth factor knockout. (Inset) Phenotype of KGF - /- mouse (right)(letf) at 2 months of age; (background) scanning electron microscopy of awl hair of KGF null mouse. (For details, see Guo et al., p. 165.) (Inset image by Charles Wellek; background SEM by John Perrino; both Universtiy of Chicago.)