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PMID 38335242

In OPLS-DA, variable importance in projection (VIP) was used to detect the influence intensity and interpretation ability of the expression mode of each metabolite on the classification and discrimination of samples, as well as to investigate differential metabolites with biological significance

Electrical signals were amplified by a high-impedance amplifier (Axon Instruments) and monitored through an audio monitor (A.M

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Low cost carbon monoxide monitors in smoking assessment