Fig. 6

H&E analysis. (a). Optical image of sample 1 in region II (muscularis) and a partial overlay with the corresponding H&E image. (b) Magnified view of the H&E stained region where PE particles were found and verified via chemical image analysis. (c) Optical image of sample 1 in region I (mucosa) and a partial overlay with the corresponding H&E image. (d) Depicts a magnified view of the H&E stained region; an isolated PE particle found in that region and verified by chemical analysis is indicated with a blue arrow. The corresponding spectrum of this particle is shown as inset.