(A) Immunoreactivity at wild-type neuromuscular junctions.
(B) High magnification view of type Ib boutons stained with anti-PSD-95 antibodies at muscle fiber 6.
(C and D) Elimination of immunoreactivity at type I boutons in dlgm52/Df. (C) Control sample showing immunoreactivity at muscles 6 and 7. (D) Similar view of a dlgm52/Df sample. Image acquisition and processing parameters were identical for wild-type and mutant samples. Scale bar equals 65 µm in (A), 5 µm in (B), and 45 µm in (C) and (D).