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.
Daga A, Tighe JE, Calabi F.Daga A, et al. Among authors: calabi f.Nature. 1992 Apr 9;356(6369):484. doi: 10.1038/356484b0.Nature. 1992.PMID: 1560822No abstract available.
Simeone A, Daga A, Calabi F.Simeone A, et al. Among authors: calabi f.Dev Dyn. 1995 May;203(1):61-70. doi: 10.1002/aja.1002030107.Dev Dyn. 1995.PMID: 7647375Free article.