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. 1997 Jan 27;136(2):367–374. doi: 10.1083/jcb.136.2.367

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Binding sites for AChE are regularly arrayed along the synaptic basal lamina. Empty frog basal lamina sheaths were incubated with either the G₄/G₂ (A and B), or A₁₂ (C and D) quail AChE and the neuromuscular junctions localized histochemically (A and C). The quail enzyme was labeled by indirect immunofluorescence using mAb 1A2 (B and D). Only the A₁₂ collagen-tailed AChE enzyme bound to the neuromuscular junction where it colocalized with the previously bound frog AChE.