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NF-kB

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This image shows two human skin cells. The cell at left is infected with the Toxoplasma gondii parasite expressing type II GRA15, which can be seen in green. The cell on the right (with a blue nucleus) is not infected. The nucleus of the infected cell contains many copies of the NF-kB transcription factor (shown in pink).

On the trail of a stealthy parasite

Biologist Jeroen Saeij shows why some strains of Toxoplasma are more dangerous than others.

January 4, 2011