Fig. 4.

Distribution of individual SM and ceramide-1-phosphates in porcine ocular lens along the equatorial plane together with optical images of porcine eye lens covered with the MALDI matrix. In MS images, white lines show the size of the ocular lens tissue slice. In the optical image, the inner black line defines the size of the ocular lens tissue, and the red line shows the area selected for the MS imaging experiment, including an area for reading MS background (on the left hand side of the optical image). CerP, ceramide-1-phosphate; MALDI, matrix-assisted laser desorption/ionization; SM, sphingomyelin.