Fig. 5 . Rapsn, utrophin and MuSK localization is disrupted in Lrp4
mutants. Immunofluorescence analysis of NMJs in control (A-C) and
Lrp4 mutant (D-F) embryos. Sections of E18.5 hind limb muscles
were stained with antibodies against Rapsn (A,D) and utrophin (Utrn; B,E).
MuSK localization was visualized on sections of E18.5 intercostal muscles
(C,F). Synaptic sites were identified by co-staining with antibodies against
synaptic vesicle proteins, SV2 (A,D,C,F) or synaptophysin (B,E).