Fig. 1
From: Anti-protein immunoglobulin M responses to pneumococcus are not associated with aging
Levels of IgM in relation to age. Levels of (a) total IgM, (b) IgM to the unencapsulated D39-ΔD pneumococcus and to the (c) Pneumococcal Surface Protein A (PspA4) were plotted against volunteer age. Correlations were analysed using linear regression analysis