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.n：胚胎样本数。F：总相对频率。HB F：后脑内相对频率。妊娠母鼠于不同发育阶段接受他莫昔芬（TM）给药处理，胚胎持续发育至预设观测阶段。其中，n为本次研究纳入的胚胎总数；F为总相对频率（以x/y表示，其中x为表现出重组事件的胚胎数量，y为对应实验组的总胚胎数）；HB F为胚胎后脑内的相对频率。