胆固醇用于生成细胞膜与激素，在细胞信号传导过程中也起着重要的作用。
It is used to form cell membranes and hormones, and plays important roles in cell signaling processes.
在神经发生和早期大脑发育过程中，外切核苷酸酶通常下调嘌呤能信号传导。
During neurogenesis and in early brain development, ectonucleotidases often downregulate purinergic signalling.
多糖参与了许多关键的生物学过程，其中包括细胞粘附，分子运输，分子降解，受体活化，信号传导和细胞内吞作用。
Glycans participate in many key biological processes including cell adhesion, molecular trafficking and clearance, receptor activation, signal transduction, and endocytosis.
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