Development of the limbs in a mouse embryo. The feet begin as a paddle shapes with the digits being created by the programmed death of tissue in the interdigital regions.

Licence: CC0 1.0 Universal

Credit: Development of the limbs in a mouse embryo. The feet begin as a paddle shapes with the digits being created by the programmed death of tissue in the interdigital regions. Paul Martin. Source: Wellcome Collection.