@misc{indiciae818c88ae7303,
  title = {Thymic factor in human sera demonstrable by a cyclic AMP assay.},
  author = {A Astaldi and G C Astaldi and P T Schellekens and V P Eijswoogel},
  year = {1976},
  doi = {10.1038/260713a0},
  url = {https://pubmed.ncbi.nlm.nih.gov/177886/},
  note = {Source identifier: 177886}
}