Visualization of the highly-ranked local image features in discriminating genes enriched in neurons and oligodendrocytes. For each highly-ranked feature (i.e., cluster center) generated by stability selection, we found the closest SIFT descriptor in the pool and then displayed the corresponding ISH image and the locations on which the SIFT descriptor was computed. The images in the left column are the ISH images along with the SIFT descriptors. The right column shows parts of the ISH images in red boxes on the corresponding image to the left. The grid is used to illustrate the 4 by 4 neighborhoods for the SIFT descriptor. The arrow denotes the direction and the length denotes the magnitude of the orientated histogram.