Expression of PSD-93 at the axon initial segment (AIS) and juxtapara (JXP)-AIS in transient axonal glycoprotein-1 (TAG-1)-/- mice. Triple immunostaining of ankyrin G (AnkG) (A), voltage-gated potassium channel (Kv)1.1 (B) and PSD-93 (C) in motor neurons (MNs), labeled with Peripherin (data not shown), of TAG-1-/- mice. Scale bar = 5 μm.