Factor Rb Activity in Human Plasma


FACTOR Rb is a protein-like, heat-labile requirement of the nematode Rhabditis briggsae Dougherty and Nigon, 1949, for growth and reproduction under axenic conditions1,2; chick embryo and mammalian liver have been shown to be good sources of it, and some activity has previously been noted in human whole blood and plasma2.


  1. 1

    Dougherty, E. C., Anat. Rec., 108, 415 (1950).

  2. 2

    Dougherty, E. C., Exp. Parasitol., 1, 34 (1951).

  3. 3

    Oncley, J. L., Symposia on Nutrition, Robert Gould Res. Found., 2 (Plasma Proteins), 3 (1950).

  4. 4

    Dougherty, E. C. (unpublished data).

  5. 5

    Dougherty, E. C. (submitted for publication).

Download references

Author information

Rights and permissions

Reprints and Permissions

About this article

Cite this article

DOUGHERTY, E. Factor Rb Activity in Human Plasma. Nature 168, 880 (1951). https://doi.org/10.1038/168880a0

Download citation

Further reading


By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.