Fig. 3.
Single ion images displaying different tissue areas in the analyzed E. fetida tissue section. a Optical image demonstrating the region of interest measured by MS imaging. b Distribution of PC (O-40:1) [M+K]+ displaying the epidermis of E. fetida. c Distribution of PC (O-36:5) [M+Na]+ displaying the distribution of this lipid in the digestive system of E. fetida. d Distribution of PC (O-34:0) [M+H]+ displaying the distribution of this lipid in the area of the coelomic fluid and muscle tissue. Scale bar = 250 µm