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Word: zona (lookup in dictionary) (lookup stats)
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...cells, the first step in development, the scientists quickly separated the cells, creating two different embryos with the same genetic information. (This sometimes happens naturally inside a mother, and the result is identical twins.) In the process, though, the researchers had to strip away an outer coating, called the zona pellucida, that is essential to development. Then came the trickiest part of the procedure. Over the years, Hall had been working with a gel derived from seaweed that could serve as a substitute for the zona pellucida. When Hall put the artificial coating around the cloned embryos, they began...

Author: /time Magazine | Title: Cloning: Where Do We Draw the Line? | 11/8/1993 | See Source »

REPORTER-RESEARCHERS: Audrey Ball, Nancy Newman, Zona Sparks (Senior Staff...

Author: /time Magazine | Title: Time Magazine Masthead July 27, 1992 Vol. 140 No. 4 | 7/27/1992 | See Source »

REPORTER-RESEARCHERS: Audrey Ball, Nancy Newman, Zona Sparks (Senior Staff...

Author: /time Magazine | Title: Time Magazine Masthead July 20, 1992 Vol. 140 No. 3 | 7/20/1992 | See Source »

REPORTER-RESEARCHERS: Audrey Ball, Nancy Newman, Zona Sparks (Senior Staff...

Author: /time Magazine | Title: Time Magazine Masthead July 6, 1992 Vol. 140 No. 1 | 7/6/1992 | See Source »

REPORTER-RESEARCHERS: Audrey Ball, Nancy Newman, Zona Sparks (Senior Staff...

Author: /time Magazine | Title: Time Magazine Masthead June 22, 1992 Vol. 139 No. 25 | 6/22/1992 | See Source »

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