Evolution and Development

Chromosome pairs: Does doubling them help or hurt? Image: Wikimedia commons

Double Trouble

20.03.2013

Evolution and Development, Genetics

Does a non-standard number of chromosomes help or hurt the cell?

Sculpture: Igor Mitoraj

When the Network is Defective

09.01.2013

Disease, Drugs & Diagnostics, Evolution and Development, Genetics

Factors that direct the formation of the heart and face must network during embryonic development

Dorsal-GFP displaying a gradient of nuclear localization

Complexity and the Single Cell

12.09.2012

Molecular and Cell Biology, Evolution and Development, Genetics

How does the fertilized egg start the process of becoming a diversified organism?

Embryonic stem cells (marked in green fluorescent protein) that should become sex cells, in which the gene encoding Utx is not present. Each column shows a gene needed for sex cell development (top row – marked in red, purple and orange). After 12 days (bottom row) the expression of the four genes has stopped and, rather than develop into sperm or ova, the stem cells die

Back to the Future

28.08.2012

Molecular and Cell Biology, Evolution and Development, Genetics

Weizmann scientists discover an enzyme that is crucial for turning back the development clock in cells

Inherited expression levels of the resistance gene (green) and the native gene (red), shown in the stomachs of unchallenged larva (left), challenged larva (center) and unchallenged larval offspring of challenged larvae, eight generations later (right)

Adapting on the Fly

01.08.2012

Biochemistry, Evolution and Development, Genetics

Can a genetic response to a short-term threat be inherited over the long term?

Three-dimensional structure of the neurohypophysis in a zebrafish embryo (the nerve fibers and blood vessels are genetically tagged with fluorescent proteins). This brain area provides an interface between nerve cells (green), arteries (purple) and veins (red)

Close Encounters of the Brain and Blood

04.01.2012

Brain & Behavior, Cancer, Immunology, Evolution and Development

A surprising new function is discovered for the “hormone of love.”

The patterns on these butterfly wings are perfectly scaled, even though they are different sizes

Built to Scale

04.10.2011

Molecular and Cell Biology, Evolution and Development, Genetics

How does a growing, developing organism keep everything in proportion?

Scale Models

Scale Models

22.08.2011

Molecular and Cell Biology, Evolution and Development, Genetics

How do organisms keep everything in proportion as they grow and develop?

Dr. Karina Yaniv. New growth

Fat Chance for Health

07.03.2011

Molecular and Cell Biology, Disease, Drugs & Diagnostics, Evolution and Development, Genetics

Dr. Karina Yaniv is overturning accepted theories on blood and lymph vessel formation.

Weizmann Institute Scientists used Accelerated Evolution to Develop: Enzymes that Provide Protection Against Nerve Gas

Weizmann Institute Scientists used Accelerated Evolution to Develop: Enzymes that Provide Protection Against Nerve Gas

24.01.2011

Biochemistry, Evolution and Development

Protection against nerve gas attack is a significant component of the defense system of many countries around the world. Nerve gases are used by...

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