This is related to the battle of cells that occurs in a Petri dish. Players control one or more cells in a map representing a Petri dish. The reverse look on a petri dish is pale to brownish. The sample is spread across one quadrant of a Petri dish containing a growth medium. One lab was able to grow 11 different types of tissues in a petri dish. These halves overlap like a Petri dish and its cover. The shape of the Petri dish also contributed to the pattern formation. When cultured in a petri dish (in vitro), they phagocytose bacteria. According to interviews, Oderus's father was a supercomputer, and his mother was a petri dish. In PGD, the egg is fertilized outside the women's body in a petri dish (IVF).