Blastocyst and cultured stem cells: University of Wisconsin Communications; all other art: © 2001 Terese Winslow, assisted by Lydia Kibiuk and Caitlin Duckwall
Blastocist dhe qeliza burimore të kultivuara: University of Wisconsin Communications; gjithë ilustrimet e tjera: © 2001 Terese Winslow, ndihmuar nga Lydia Kibiuk dhe Caitlin Duckwall