Key B cell subtypes relevant to stroke can be classified as follows: plasmablasts (CD27+CD38+), unswitched memory B cells (CD27+IgD+), switched memory B cells (CD27+IgD−), naïve B cells (CD27−IgD+), and double-negative B cells (CD27−IgD−) (Table 2). This evidence concerns the gene CD27 and stroke disorder.