头发样本要经过法医学DNA工作所规定的方法进行准备,其中涉及一种需要精细操作的“化学洗涤”以确保头发的表面没有任何污染。经过洗涤步骤,没有DNA能够再恢复原样。在升高的气温中,经过一个延长的萃取步骤,头发分裂成许多小段,重复煮沸,然后再用干冰冷冻,每一小段中的DNA都与其蛋白质框架分离开来,净化后就可以准备下一个步骤——PCR扩 Hair samples are prepared in accordance with the methods prescribed in forensic DNA work, which involves a “chemical wash” that requires careful handling to ensure that the surface of the hair is free from any contamination. After the washing step, no DNA can be restored to its original state. At an elevated temperature, after a prolonged extraction step, the hair is split into small pieces, boiled repeatedly and then frozen in dry ice. The DNA in each small piece is separated from its protein framework and purified to prepare for the next Steps - PCR expansion