@misc{indiciae33f1ed49ee73,
  title = {Paramagnetic probes of macromolecules.},
  author = {J J Villafranca},
  year = {1989},
  doi = {10.1016/0076-6879(89)77023-3},
  url = {https://pubmed.ncbi.nlm.nih.gov/2575205/},
  note = {Source identifier: 2575205}
}