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Principal-component analysis (PCA) of SARS-CoV-2 serological assays. Principal-component analysis was performed using all three ELISAs (spike, RBD, and nucleocapsid) and pseudotyped virus neutralization platforms (GFP, luciferase, and SEAP). The authentic virus ND50 is indicated by the color of the data point. PCA loadings generated during the analysis are shown on the right.
