An official website of the United States government
The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before
sharing sensitive information, make sure you’re on a federal
government site.
The site is secure.
The https:// ensures that you are connecting to the
official website and that any information you provide is encrypted
and transmitted securely.
Appel LF, Prout M, Abu-Shumays R, Hammonds A, Garbe JC, Fristrom D, Fristrom J.Appel LF, et al. Among authors: fristrom d.Proc Natl Acad Sci U S A. 1993 Jun 1;90(11):4937-41. doi: 10.1073/pnas.90.11.4937.Proc Natl Acad Sci U S A. 1993.PMID: 7685111Free PMC article.
Fristrom DK, Fekete E, Fristrom JW.Fristrom DK, et al.Wilehm Roux Arch Dev Biol. 1981 Jan;190(1):11-21. doi: 10.1007/BF00868698.Wilehm Roux Arch Dev Biol. 1981.PMID: 28305365