The structure of the cornified claw sheath in the domesticated cat (Felis catus): implications for the claw-shedding mechanism and the evolution of cornified digital end organs. - Homberger DG; Ham K; Ogunbakin T; Bonin JA; Hopkins BA; Osborn ML; Hossain I; Barnett HA; Matthews KL 2nd; Butler LG; Bragulla HH (Journal of anatomy, 2009)