The carbohydrate CT1 is expressed in topographically fixed glomeruli in the mouse olfactory bulb

► CT1 carbohydrate is expressed by a restricted subpopulation of olfactory axons. ► Positions of CT1 glomeruli in the main olfactory bulb are topographically fixed. ► CT1 glomeruli are always apposed to M72 odorant receptor glomeruli. ► CT1 together with other carbohydrates contribute to olfactory axon guidance.