Originally branded by Budd as Metropolitans, the cars are more popularly known under their model names, M1 (late 1960s/early 1970s cars) and M3 (mid-1980s cars). The Metro-North cars were branded under the M1A and M3A series.

However, they also began to operate variations of the new M1 railcar which was designated as the "M1A." The next new fleet of EMUs came with the M2s, which replaced Pullman 4400-series cars dating back to the early 1920s to 1954 from 1973 to 1977.

甲基化修饰 是最常见的RNA修饰之一，包括m6A、m5C、m1A、m7G等，参与RNA稳定性、定位、剪接、翻译以及降解等过程。 02.技术优势 03.

N1-甲基腺苷（N1-methyladenosine，m1A）是一种普遍存在于真核生物tRNA、rRNA和mRNA且可逆的转录后RNA修饰。基于高通量测序技术最新研究揭示m1A RNA修饰在基因调控和生物过程中的关键作用：对RNA稳定性和翻译起始…

2018年8月7日 · 研究表明，m1A 是真核生物 tRNA 和 rRNA 丰度很高的一种转录后修饰，近期研究也表明 m1A 修饰可调控 mRNA 翻译。m1A 修饰作为一类新型 RNA 甲基化，其功能和机制都亟待挖掘。云序生物作为m1A RNA甲基化研究的先驱者，能够为客户提供专业和优质的m1A RNA甲 …

2023年1月1日 · Populus trichocarpa MTA (PtrMTA) overexpression leads to increased density of trichomes and a more developed root system than that of wild type plants, revealing the importance of this enzyme in poplar trichome and root development (Lu et al., 2020).

mRNA最常见的内部修饰包括 N6-腺苷酸甲基化 （m6A）、 N1-腺苷酸甲基化 （m1A）、 胞嘧啶羟基化 （m5C）等。 对于大热的m6A，全球的科学家已经鉴定了参与m6A的许多酶，包括 去甲基化酶 、甲基化酶和 甲基化识别酶 等。

2025年1月28日，来自上海交通大学医学院&重庆医科大学李华兵研究员团队在Journal of Experimental Medicine杂志在线发表了题为tRNA m1A modification regulates cholesterol biosynthesis to promote antitumor immunity of CD8+ T cells的研究论文，该研究首次发现TRMT61A介导的tRNA m1A修饰通过调控胆固 ...

2022年9月22日 · These m1A-modified early tRNAs enhance translation efficiency, enabling rapid and necessary synthesis of MYC and of a specific group of key functional proteins.

Originally branded by Budd as The Metropolitans, the cars are more popularly known under their model names, M1 (late 1960s/1970s cars) and M3 (1980s cars). The proper name for the Metro North series are the M1A and M3A respectively though they are colloquially called by the main LIRR designations for the sake of simplicity.