5VFG:
reference: High affinity interactions of Pb(2+) with synaptotagmin I., Katti S, Her B, Srivastava AK, Taylor AB, Lockless SW, Igumenova TI, Metallomics. 2018 Sep 19;10(9):1211-1222. doi: 10.1039/c8mt00135a. PMID: 30063057

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