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.
The Daisen Kofun presumably entombs Emperor Nintoku, the 16th emperor of Japan, but since the early 1970s the Japanese government has restricted further archaeological research. The Daisen Kofun is one of many burial mounds in the Sakai City and the Osaka Prefecture. Forty seven kofun, including the Daisen Kofun, make up the Mozu Tumulus. The other kofun were built not by emperors but by other wealthy elites of a growing Japan.