https://embryo.asu.edu/pages/amphioxus-and-mosaic-theory-development-1893-edmund-beecher-wilson
"Amphioxus, and the Mosaic Theory of Development" (1893), by Edmund Beecher Wilson
Edmund Beecher Wilson experimented with Amphioxus (Branchiostoma) embryos in 1892 to identify what caused their cells to differentiate into new types of cells...
edmund beecher wilsonthe mosaictheory ofdevelopment
https://dnalc.cshl.edu/view/16260-Biography-9-Edmund-Beecher-Wilson-1856-1939-.html
Biography 9: Edmund Beecher Wilson (1856-1939) :: CSHL DNA Learning Center
edmund beecher wilsondna learning centerbiography