1JVA:
reference: Protein-splicing reaction via a thiazolidine intermediate: crystal structure of the VMA1-derived endonuclease bearing the N and C-terminal propeptides., Mizutani R, Nogami S, Kawasaki M, Ohya Y, Anraku Y, Satow Y, J Mol Biol 2002 Mar 1;316(4):919-29. PMID: 11884132

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