Peg3 conditional knockout mothers: nest-building behavior.

(a) Representative conditional knockout dams and wild-type littermates highlight differences observed in the nest-building behavior. (b) A graph shows the number of dams marked as good, mediocre and bad at building nests for their litters. “Good” dams are those who tore 100% of bedding material by 14 hours. “Mediocre” dams were able to use some, but not all of the bedding material by 14 hours. “Bad” dams are those that display no interest in tearing up the bedding material to insulate their pups.(a) 代表性的条件性敲除母鼠（conditional knockout dams）与野生型同窝母鼠，清晰呈现了二者在筑巢行为中的观测差异。(b) 一幅图表统计了按为幼崽筑巢的能力划分为优秀、中等与劣质的母鼠数量。其中，"优秀"母鼠指在14小时内将全部垫料撕碎的个体；"中等"母鼠可在14小时内使用部分但未完全使用垫料；"劣质"母鼠则对撕碎垫料以搭建幼崽保暖巢穴毫无兴趣。