Yoshiki Sasai was one of the pre-eminent stem cell biologists. Known as the "Brainmaker," he developed methods to guide human embryonic stem cells (hESCs) into forming brain cortex, eyes, and other organs in tissue culture. Yoshiki was a man of rectitude and a scientist of high personal integrity, following in the line of his samurai ancestors. He always assumed responsibility. Since his postdoctoral studies, he was called Sensei, which means teacher, by those that knew him well. It was an affectionate sign of the high respect in which this scholar was held.
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