| Summary of
mutant phenotypes |
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| • | Agrin -/-:
few ACh-R clusters, overshooting of axons |
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| • | MuSK -/-:
no ACh-R clusters, overshooting of axons |
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| • | Rapsyn -/-:
no ACh-R clusters, but higher receptor |
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| levels in
synaptic area, only limited overshooting |
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| • | Pre-synaptic
defects in all mutants, due to the lack of |
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| retrograde
signals from the muscle |
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