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.
Nan X, Cross S, Bird A.Nan X, et al. Among authors: bird a.Novartis Found Symp. 1998;214:6-16; discussion 16-21, 46-50. doi: 10.1002/9780470515501.ch2.Novartis Found Symp. 1998.PMID: 9601009Review.
Nan X, Ng HH, Johnson CA, Laherty CD, Turner BM, Eisenman RN, Bird A.Nan X, et al. Among authors: bird a.Nature. 1998 May 28;393(6683):386-9. doi: 10.1038/30764.Nature. 1998.PMID: 9620804