Scatter plots of the g-ratio (the ratio of the inner axonal diameter to the total outer diameter of myelinated fiber) as a function of axon diameter in sham mice or stroke mice treated with vehicle or IL-4 revealed significant differences in myelin thickness (average g-ratio: sham = 0.72 [n = 183 axons from 3 animals]; MCAO + vehicle = 0.79 [n = 233 axons from 3 animals]; MCAO + IL-4 = 0.73 [n = 176 axons from 3 animals]) (Fig 5C). The gene discussed is IL4; the disease is Stroke.