Nucleotide substitutions within the fold-back arms of the novel pre-miR159 genes and the corresponding pairing in the secondary structure among 42 Phalaenopsis species.

aNucleotide position according to Figure 1. Positions 1–73, 74–139, and 140–214 represent the 5′ fold-back arm, the terminal loop region, and the 3′ fold-back arm, respectively.*Represents increasing stability (new base pairing) of the fold-back structure; ** Represents a minor change in fold-back stability (increase or decrease) without destroying the nucleotide pairing (i.e., A-U→G-U, G-C→G-U, G-U→G-C, or G-U→A-U); *** Represents no change in the fold-back stability or substitutions located in the internal loopsNucleotide substitutions within the fold-back arms of the novel pre-miR159 genes and the corresponding pairing in the secondary structure among 42 Phalaenopsis species.核苷酸位置参照图1。位置1–73、74–139及140–214分别对应5'回折臂、末端环区以及3'回折臂。* 代表回折结构稳定性提升（形成新碱基配对）；** 代表回折稳定性发生轻微变化（升高或降低）但未破坏核苷酸配对（即A-U→G-U、G-C→G-U、G-U→G-C或G-U→A-U）；*** 代表回折稳定性无变化，或替换发生在内部环区域。本数据集涉及42种蝴蝶兰属（Phalaenopsis）物种中新型pre-miR159基因回折臂内的核苷酸替换，及其二级结构中的对应配对关系。