脂壁酸或称为脂磷壁酸（英语：Lipoteichoic acid，简称：LTA）是革兰氏阳性菌菌体细胞壁的成分之一，构成了厚达80纳米的肽聚糖层。LTA由重复性的甘油磷酸（glycerophosphate, GroP）骨架组合而成，并提供二酰基甘油固定在细胞膜上[1]。
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