Periaxonal space swelling, axonal enlargement, and myelin outfoldings in slc12a2b^ue58 mutants. (A) TEM images of the pLLn in control (left) and slc12a2b^ue58 mutant animals showing an enlarged axon (asterisk) with periaxonal swelling (middle) and myelin outfoldings (arrowheads; right). Scale bar, 1 µm.