Relative frequencies of induction (and therefore recombination).

n: number of embryos.
F: total relative frequency.
HB F: frequency within the hindbrain.
Pregnant mothers were administrated with TM at different developmental stages. Embryonic development proceeds until the desired observation stage. n, number of studied embryos; F, total relative frequency (x/y) where x is the number of embryos displaying recombination events, and y the total number of embryos per experimental group; HB F, relative frequency within the hindbrain.