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Fig. 6. Electron microscopic images of purified acetylcholine receptors from
electric rays show them to be dimers. The affinity-purified acetylcholine
receptor from H. monopterigium was viewed under the electron
microscope in negative stain and is shown in A. Receptor dimers are evident in
this (boxes in A) and all other acetylcholine receptor preparations isolated
on the TDAC affinity column: (B) T. marmorata; (C) N.
tasmaniensis.