Grey matter refers to unmyelinated neurons and other cells of the central nervous system. It is present in the brain, brainstem and cerebellum, and present throughout the spinal cord.rey matter refers to unmyelinated neurons and other cells of the central nervous system. It is present in the brain, brainstem and cerebellum, and present throughout the spinal cord.
Kaz Tada (left) was one of those rounded up. Kaz was a Nisei  a person born in America of parents who immigrated from Japan. Nisei is a Japanese word meaning second generation. Isei refers to first generation immigrants, those who came the U.S. from Japan. And Sensei refers to third generation Japanese Americans.
Kanata Hongo. Joichiro Nishi (è¥¿ ä¸ä¸é, Nishi JÅichirÅ) is a middle-school (8th grade) veteran of the Gantz world, having arrived there over a year before the beginning of the Gantz. Gantz calls him Mr. Nishi, which is rather interesting given how informally or derisively he refers to most of the other participants.ppearance Edit. Nishi has black hair but a green tint in it in the anime. Nishi also has brown eyes and fair skin. In the manga, he is shown with somewhat shifty eyes.