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Cell death in developing chick and duck autopods. Dying cells in the autopods of both birds stain with red dye at the web tips. An artifact creates the more general staining in the duck interdigital webs. (Left, Reproduced with permission from Zuarte-Luís and Hurlé 2002; right, reprinted from Gañan et al. 1998, ©1998 with permission from Elsevier.)
