4R2K:
reference: Structural and functional analysis of two universal stress proteins YdaA and YnaF from Salmonella typhimurium: possible roles in microbial stress tolerance., Bangera M, Panigrahi R, Sagurthi SR, Savithri HS, Murthy MR, J Struct Biol. 2015 Jan 16. pii: S1047-8477(15)00004-0. doi:, 10.1016/j.jsb.2015.01.003. PMID: 25600413

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