1IE6:
reference: Molecular basis of the high-affinity activation of type 1 ryanodine receptors by imperatoxin A., Lee CW, Lee EH, Takeuchi K, Takahashi H, Shimada I, Sato K, Shin SY, Kim DH, Kim JI, Biochem J. 2004 Jan 15;377(Pt 2):385-94. PMID: 14535845

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