脂壁酸或稱為脂磷壁酸（英語：Lipoteichoic acid，簡稱：LTA）是革蘭氏陽性菌菌體細胞壁的成分之一，構成了厚達80納米的肽聚糖層。LTA由重複性的甘油磷酸（glycerophosphate, GroP）骨架組合而成，並提供二酰基甘油固定在細胞膜上[1]。
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