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PD-1

A cell chamber is mounted on a microscope. Three micropipettes, inserted into the chamber from both sides, are used to aspirate individual cells, to bring them into contact so that researchers can study their interactions. This is the kind of methodology that Cheng Zhu and his colleagues used to study PD-1.
Zhu Lab Explains the Inhibitory Role of World’s Most Famous Molecule

Cheng Zhu leads study of immune system protein that helps control T cell activity

Technology from the Zhu lab: A cell chamber is mounted on a microscope. Three micropipettes, inserted into the chamber from both sides, are used to aspirate individual cells, to bring them into contact so that researchers can study their interactions. This is the kind of methodology that Cheng Zhu and his colleagues used to study PD-1, which might be the most famous molecule in the world. 
Zhu Lab Explains the Inhibitory Role of World’s Most Famous Molecule

New research teases apart the mechanisms behind the checkpoint protein PD-1