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pages = {},  pubmed_id = {26232926},  }  @article{25239571,  title = {{pH-dependent random coil (1)H, (13)C, and (15)N chemical shifts of the ionizable amino acids: a guide for protein pK a measurements.}},  date = {2014 Nov},  source = {J Biomol NMR},  authors = {Platzer, G and Okon, M and McIntosh, LP},  author = {Platzer, G and Okon, M and McIntosh, LP},  year = {2014},  month = {Nov},  journal = {J Biomol NMR},  volume = {60},  number = {},  pages = {109-29},  pubmed_id = {25239571},  }