4AS8:
reference: Alteration of fluorescent protein spectroscopic properties upon cryoprotection., von Stetten D, Batot GO, Noirclerc-Savoye M, Royant A, Acta Crystallogr D Biol Crystallogr. 2012 Nov;68(Pt 11):1578-83. doi:, 10.1107/S0907444912037900. Epub 2012 Oct 18. PMID: 23090407

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