Riddle: Related articles about three Japanese people (guess a physics noun)

Crystalline

Viruses do not have a complete cell structure, so they cannot independently carry out metabolism, reproduction and other activities; viruses live a parasitic life and must be in living cells to show biological activity; leave After entering the host cell, in order to ensure the integrity of its own nucleic acids and unchanged proteins, it forms spores, which are what you call "crystals".