以下为句子列表：
英文: Polysialic acid is a unique carbohydrate composed of a linear homopolymer of α,8-linked sialic acid, and is mainly attached to the neural cell adhesion molecule (NCAM) via a typical N-linked glycan in vertebrate neural system.
中文: 多聚唾液酸(polysialic acid,PSA)是一类线性、均一多聚α,8连接唾液酸的独特碳水化合物,它主要通过典型的N-连接糖苷键附着在脊椎动物神经系统神经黏附分子(neural cell adhesion molecule,NCAM)上。
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