Molecular ‘Kiss Of Death’ Flags Pathogens For Destruction

The body uses a molecule called ubiquitin, here shown in red inside the box, to tag little pockets of pathogen, called vacuoles, as they bloom on the surface of a cell. The vacuole in this image is full of Chlamydia trachomatis, the bacteria which cause a common sexually transmitted infection, but the ubiquitin molecules have marked the vacuole for destruction by the immune system.
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