The fMRI patterns elicited by mouse urine samples in the accessory olfactory bulb (AOB). a: Patterns in two adjacent slices elicited by (left to right): urine from strain H-2k, urine from strain H-2b, and amyl acetate (AA). b: Flat map representation of the patterns in the entire AOB (same order as in a). c: The ratio of the total signal in the AOB over the main olfactory bulb (MOB) for urine samples (H-2k and H-2b) is much higher than that for amyl acetate. Scale bar = 1.0 mm in a.