Schott G D
National Hospital for Neurology and Neurosurgery, London WC1N 3BG.
BMJ. 2005 Dec 24;331(7531):1509-10. doi: 10.1136/bmj.331.7531.1509.
Sex symbols on pedigrees were illustrated quite differently 150 years ago. What brought about the change?
150年前,系谱上的性别符号绘制方式截然不同。是什么导致了这种变化?