3e20 is a 8 chain structure with sequence from Schizosaccharomyces pombe. Full crystallographic information is available from OCA.
Reference
Cheng Z, Saito K, Pisarev AV, Wada M, Pisareva VP, Pestova TV, Gajda M, Round A, Kong C, Lim M, Nakamura Y, Svergun DI, Ito K, Song H. Structural insights into eRF3 and stop codon recognition by eRF1. Genes Dev. 2009 May 1;23(9):1106-18. PMID:19417105 doi:23/9/1106
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