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. 2017 May 19;8:15470. doi: 10.1038/ncomms15470

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Copyright © 2017, The Author(s)

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(a) Position of the Sec translocon on the RNC in close proximity to the extending signal sequence, bound to the SRP M domain, and the A-domain of SR. (b) Close-up views of the interactions between the M-domain fingerloop of the SRP protein and the ribosomal protein uL29 (wheat), where the signal sequence extends three helical turns outwards from the M-domain.