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. 2018 Apr 19;13(4):e0191261. doi: 10.1371/journal.pone.0191261

Fig 4. Principal components analysis of serum and saliva IgG and IgA levels to the different meningococcal serotypes.

Fig 4

For this analysis, data of T1 was selected as these data had the highest variance. The Eigenvalues (have to exceed 1 to be explanatory) and the variance explained along the component axes are indicated. SBA = serum bactericidal assay.