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.
Born in 1799 to a greengrocer's family in Fukui Prefecture, Yohei left home in 1818 after dedicating more than ten years of service to his family's business. After moving to Tokyo and changing jobs several times, Yohei created his nigiri (squeezed) sushi and started selling it by carrying a box of it on his back. From about 1828, when Yohei was in his thirties, he started selling his sushi at a stand. As word spread of this new type of sushi that could be popped into the mouth, nigiri-sushi grew in popularity, and Yohei's business prospered.