2AKF:
reference: A conserved trimerization motif controls the topology of short coiled coils., Kammerer RA, Kostrewa D, Progias P, Honnappa S, Avila D, Lustig A, Winkler FK, Pieters J, Steinmetz MO, Proc Natl Acad Sci U S A 2005 Sep 19;. PMID: 16172398

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