Gastrulation:

Fate Mapping

Fate mapping was developed by Walter Vogt as a means by which to trace the development of specific regions of the early embryo. To do this, Vogt used agar chips impregnated with vital dyes

Four___One___Two___Three

In the neurula, elongation continues (for example, note dots #3 and 4).

Click the highlighted numbers to see how vital staining was described by Vogt in his original work.