5DZX:
reference: Structural Basis of Diverse Homophilic Recognition by Clustered alpha- and beta-Protocadherins., Goodman KM, Rubinstein R, Thu CA, Bahna F, Mannepalli S, Ahlsen G, Rittenhouse C, Maniatis T, Honig B, Shapiro L, Neuron. 2016 May 18;90(4):709-23. doi: 10.1016/j.neuron.2016.04.004. Epub 2016, May 5. PMID: 27161523

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