Article PDF
Rights and permissions
About this article
Cite this article
The Rockefeller Foundation. Nature 193, 1240 (1962). https://doi.org/10.1038/1931240a0
Issue Date:
DOI: https://doi.org/10.1038/1931240a0
Nature volume 193, page 1240 (1962)
The Rockefeller Foundation. Nature 193, 1240 (1962). https://doi.org/10.1038/1931240a0
Issue Date:
DOI: https://doi.org/10.1038/1931240a0