The extra finger of the chicken

Foto científica Ellipse 13

The extra finger of the chicken

In this image from the CMRB we can see the induction of an extra finger in the interdigital space of a chicken. This finger has grown thanks to a microsphere (the blue dot in the image) that is covered in Activin A, a molecule with the ability to form cartilage. The microsphere was introduced in the interdigital space of the chicken embryo when it was 5 days old. After incubating it for 3 more days, the Activin A has induced the formation of the finger.

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