This study provides evidence that capsule phase variation can occur in pn …

Most of the pictures pn show result from that process.

This is a novel mechanism by which S. pn modulates type I IFN response in macrophages.

And a light-emitting diode (LED) is a pn junction with a current that generates light.

Its phase shifter utilizes carrier depletion of pn diodes for high speed, but suffers low modulation efficiency.