Would you like a receipt? http://beeg.in.net/ begg.com  The minibrains grew 2-3 millimeters (0.08-0.1 in) in diameter, and have survived in lab dishes for 10 months so far. Their size is limited, because they lack a circulatory system to provide nutrients and oxygen to their core regions. As a result, the brains could not develop the many layers seen in a real human brain, the researchers said.