Similarly, the gradients produced by cells may influence cellular fate by their temporal and spatial characteristics. In certain organisms, the choice of cell fate can be determined by a gradient, a binary choice, or through a relay of molecules released by a cell.[1] If cell fate is binary, the identity of the cell is influenced by the presence or absence of a signaling molecule; consequently, these signals can also induce cell fate acting in a relay.[1] The relay functions by the source cell releasing a signaling molecule into the environment. Adjacent cells possessing similar cell identities respond to these signals and can release different signaling molecules to cells in their surrounding area, promoting additional new cell fates.