Cilia on the outer surface of the embryo's underside, an area called the ventral node in mammals, exhibit a characteristic twirling movement that wafts chemical messengers over to the left side.
绒毛位于胚胎的外侧面，在哺乳动物称为腹节，表现出典型的环行运动，将化学物质引导到机体的左侧面。
Rabbit brady arrhythmia model due to acute sinoatrial node damage was made by overlaying 30% formaldehyde on the surface of sinoatrial node area.
用30%甲醛外敷窦房结区表面，造家兔窦房结急性损伤致缓慢型心律失常模型。
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