河北
参考文献
[1] O. Henry. (1907). The Last Leaf. McClure, Phillips & Co.
[2] 李继承，曾园山主编.本科临床西医教材 组织学与胚胎学 第9版[M].北京：人民卫生出版社,2018.
[3] Steingrímsson E, Copeland NG, Jenkins NA. Melanocyte stem cell maintenance and hair graying. Cell. 2005;121(1):9-12. doi:10.1016/j.cell.2005.03.021
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来源：科普中国
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