To compare the peripheral blood levels of methionine (Met), S‐adenosylmethionine (SAM), S‐adenosylhomocysteine (SAH), and the SAM/SAH ratio (the most core and predictive indices of cellular methylation ability) between patients with autism spectrum disorder (ASD) and control subjects.

中文翻译：

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自闭症谱系障碍中甲基化能力的血液生物标志物水平：系统评价和荟萃分析

比较自闭症谱系障碍患者外周血甲硫氨酸（Met）、S-腺苷甲硫氨酸（SAM）、S-腺苷高半胱氨酸（SAH）水平和SAM/SAH比值（细胞甲基化能力的最核心和预测指标） (ASD) 和控制对象。