Besides regular single base mutations(SNPs) and large fragment deletions or rearrangement,variation of the numbers of mtDNA molecules in organelles was always neglected by most investigators.

• 除了对常规的单碱基突变(单核苷酸多态性)和大片段缺失或重排进行检测外,细胞器内线粒体DNA数量的变化作为突变的一个重要方面则往往为研究者所忽略。