6OKD:
reference: A TfR-Binding Cystine-Dense Peptide Promotes Blood-Brain Barrier Penetration of Bioactive Molecules., Crook ZR, Girard E, Sevilla GP, Merrill M, Friend D, Rupert PB, Pakiam F, Nguyen E, Yin C, Ruff RO, Hopping G, Strand AD, Finton KAK, Coxon M, Mhyre AJ, Strong RK, Olson JM, J Mol Biol. 2020 Apr 15. pii: S0022-2836(20)30279-5. doi:, 10.1016/j.jmb.2020.04.002. PMID: 32304700

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