Fig. 5.

Electron microscopic features of milk. a, Thin-section electron microscopic images of milk lipid droplets. Upper panels, milk collected from mice fed NPD. Middle and lower panels, milk collected from mice fed LPD. Right panels, enlarged images of boxes in the left images. Asterisk, lipid droplet. Arrowheads, the outer lining of the lipid membrane. Black arrows, fragile membrane. Red arrows, ectopic accumulation of dense substances. Scale bars, 10 μm for left panels and 5 μm for right panels. b, Number of casein particles. Red arrowheads, casein particles. Scale bar, 1 μm. c, Comparison of milk lipid droplet diameters. Long and short axes were plotted. Double-ended arrows, long axis in the milk lipid droplets. Scale bar, 5 μm.