Mice expressing intermediate CD45 levels survive B. anthracis
infection. A, mice with intermediate CD45 expression levels (62%)
challenged with Ames B. anthracis spores showed a 65% survival rate.
In contrast, CD45100%, CD450%, CD4511%,
CD4536%, or CSV10+/- (62%) mice with inactive CD45
phosphatase activity showed little to no protection after B.
anthracis challenge. B, immunohistochemical staining of spleen
with anti-capsule antibody did not show any bacterial load in the
CD4562% mice surviving B. anthracis challenge (∼48 h)
(right panel) versus moribund CD45100% mice (48
h) (left panel). Scale bar = 100 μm, 20×
magnification. RP, red pulp; MZ, marginal zone;
PALS, periarteriolar lymphoid sheath.