K The representative images of IF-IHC staining of choroid plexus of E14.5 embryonic brains with antibodies against Iba-1 (green), CD68 (red) and DAPI (blue). Scale bar, 50 μm. L Percentage of CD68+; Iba-1+ cells out of total Iba-1+ cells. Data information: *P<0.05, **P<0.01, ***P<0.001, ****P<0.0001, two-tailed unpaired t-test. All data are presented as mean ± SEM. 